<?xml version="1.0" encoding="us-ascii"?>
<!--XBRL document created with Toppan Merrill Bridge  10.2.0.4 -->
<!--Based on XBRL 2.1-->
<!--Created on: 3/15/2023 5:39:21 PM-->
<!--Modified on: 3/15/2023 5:39:21 PM-->
<xsd:schema targetNamespace="http://acimume.com/20221231" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:aciu="http://acimume.com/20221231" xmlns:deprecated="http://www.xbrl.org/2009/role/deprecated" xmlns:us-roles="http://fasb.org/us-roles/2021-01-31" xmlns:currency="http://xbrl.sec.gov/currency/2021" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:fact-explanatoryFact="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:ifrs-full="http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full" xmlns:us-types="http://fasb.org/us-types/2021-01-31" xmlns:srt-roles="http://fasb.org/srt-roles/2021-01-31" xmlns:utr="http://www.xbrl.org/2009/utr" xmlns:us-gaap="http://fasb.org/us-gaap/2021-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:stpr="http://xbrl.sec.gov/stpr/2021" xmlns:sic="http://xbrl.sec.gov/sic/2021" xmlns:srt-types="http://fasb.org/srt-types/2021-01-31" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:country="http://xbrl.sec.gov/country/2021" xmlns:net="http://www.xbrl.org/2009/role/net" xmlns:naics="http://xbrl.sec.gov/naics/2021" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:dei="http://xbrl.sec.gov/dei/2021q4" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:exch="http://xbrl.sec.gov/exch/2021" xmlns:attributeFormDefault="unqualified" xmlns:srt="http://fasb.org/srt/2021-01-31" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrli="http://www.xbrl.org/2003/instance">
  <xsd:annotation>
    <xsd:appinfo>
      <link:roleType roleURI="http://acimume.com/role/StatementCondensedConsolidatedBalanceSheets" id="StatementCondensedConsolidatedBalanceSheets">
        <link:definition>00100 - Statement - Condensed Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/StatementCondensedConsolidatedStatementsOfIncomeLoss" id="StatementCondensedConsolidatedStatementsOfIncomeLoss">
        <link:definition>00200 - Statement - Condensed Consolidated Statements of Income/(Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeLoss" id="StatementCondensedConsolidatedStatementsOfComprehensiveIncomeLoss">
        <link:definition>00300 - Statement - Condensed Consolidated Statements of Comprehensive Income/(Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/StatementCondensedConsolidatedStatementsOfCashFlows" id="StatementCondensedConsolidatedStatementsOfCashFlows">
        <link:definition>00500 - Statement - Condensed Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilitiesStatementOfIncomeLossAndCashFlowDetails" id="DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilitiesStatementOfIncomeLossAndCashFlowDetails">
        <link:definition>40502 - Disclosure - Right-of-use assets, long-term financial assets and lease liabilities - Statement of income/(loss) and cash flow (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureAssetAcquisitionDetails" id="DisclosureAssetAcquisitionDetails">
        <link:definition>40601 - Disclosure - Asset acquisition (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosurePrepaidExpensesAndAccruedIncomeDetails" id="DisclosurePrepaidExpensesAndAccruedIncomeDetails">
        <link:definition>40901 - Disclosure - Prepaid expenses and accrued income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureOtherCurrentReceivablesDetails" id="DisclosureOtherCurrentReceivablesDetails">
        <link:definition>41001 - Disclosure - Other current receivables (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureTradeAndOtherPayablesAndAccruedExpensesDetails" id="DisclosureTradeAndOtherPayablesAndAccruedExpensesDetails">
        <link:definition>41201 - Disclosure - Trade and other payables and accrued expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureExpensesByCategoryDetails" id="DisclosureExpensesByCategoryDetails">
        <link:definition>41401 - Disclosure - Expenses by category (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRelatedPartyTransactionsDetails" id="DisclosureRelatedPartyTransactionsDetails">
        <link:definition>41501 - Disclosure - Related-party transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureIncomeTaxesSummaryOfIncomeTaxExpenseDetails" id="DisclosureIncomeTaxesSummaryOfIncomeTaxExpenseDetails">
        <link:definition>41601 - Disclosure - Income taxes - Summary of Income Tax Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlanSummaryOfBenefitPlanDetails" id="DisclosureRetirementBenefitPlanSummaryOfBenefitPlanDetails">
        <link:definition>41701 - Disclosure - Retirement benefit plan - Summary of Benefit Plan (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlanAmountsRecordedInConsolidatedStatementsOfIncomeLossDetails" id="DisclosureRetirementBenefitPlanAmountsRecordedInConsolidatedStatementsOfIncomeLossDetails">
        <link:definition>41702 - Disclosure - Retirement benefit plan - Amounts recorded in consolidated statements of income (loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlanChangeInOtherComprehensiveGainsLossesDetails" id="DisclosureRetirementBenefitPlanChangeInOtherComprehensiveGainsLossesDetails">
        <link:definition>41706 - Disclosure - Retirement benefit plan - Change in other comprehensive gains (losses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureEarningsPerShareDetails" id="DisclosureEarningsPerShareDetails">
        <link:definition>42001 - Disclosure - Earnings per share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DocumentDocumentAndEntityInformation" id="DocumentDocumentAndEntityInformation">
        <link:definition>00090 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/StatementCondensedConsolidatedStatementsOfChangesInEquity" id="StatementCondensedConsolidatedStatementsOfChangesInEquity">
        <link:definition>00400 - Statement - Condensed Consolidated Statements of Changes in Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSummaryOfSignificantAccountingPoliciesRightOfUseAssetsAndLeaseLiabilitiesDetails" id="DisclosureSummaryOfSignificantAccountingPoliciesRightOfUseAssetsAndLeaseLiabilitiesDetails">
        <link:definition>40302 - Disclosure - Summary of significant accounting policies, Right-of-use assets and lease liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentDetails" id="DisclosureSummaryOfSignificantAccountingPoliciesPropertyPlantAndEquipmentDetails">
        <link:definition>40303 - Disclosure - Summary of significant accounting policies, Property, plant and equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosurePropertyPlantAndEquipmentDetails" id="DisclosurePropertyPlantAndEquipmentDetails">
        <link:definition>40401 - Disclosure - Property, plant and equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilitiesDetails" id="DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilitiesDetails">
        <link:definition>40501 - Disclosure - Right-of-use assets, long-term financial assets and lease liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilitiesContractualUndiscountedCashFlowsForLeaseObligationsDetails" id="DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilitiesContractualUndiscountedCashFlowsForLeaseObligationsDetails">
        <link:definition>40503 - Disclosure - Right-of-use assets, long-term financial assets and lease liabilities - Contractual undiscounted cash flows for lease obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureIntangibleAssetsDetails" id="DisclosureIntangibleAssetsDetails">
        <link:definition>40701 - Disclosure - Intangible assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureCashAndCashEquivalentsAndFinancialAssetsCashAndCashEquivalentsDetails" id="DisclosureCashAndCashEquivalentsAndFinancialAssetsCashAndCashEquivalentsDetails">
        <link:definition>40801 - Disclosure - Cash and cash equivalents and financial assets, Cash and cash equivalents (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalNarrativesDetails" id="DisclosureShareCapitalNarrativesDetails">
        <link:definition>41101 - Disclosure - Share capital - Narratives (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalCapitalStructureDetails" id="DisclosureShareCapitalCapitalStructureDetails">
        <link:definition>41102 - Disclosure - Share capital - Capital Structure (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalConditionalShareCapitalForBondsAndSimilarDebtInstrumentsDetails" id="DisclosureShareCapitalConditionalShareCapitalForBondsAndSimilarDebtInstrumentsDetails">
        <link:definition>41104 - Disclosure - Share capital - Conditional share capital for bonds and similar debt instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalConditionalShareCapitalForEmployeeBenefitPlansDetails" id="DisclosureShareCapitalConditionalShareCapitalForEmployeeBenefitPlansDetails">
        <link:definition>41105 - Disclosure - Share capital - Conditional share capital for employee benefit plans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalShelfRegistrationStatementDetails" id="DisclosureShareCapitalShelfRegistrationStatementDetails">
        <link:definition>41106 - Disclosure - Share capital - Shelf registration statement (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalAtMarketEquityOfferingDetails" id="DisclosureShareCapitalAtMarketEquityOfferingDetails">
        <link:definition>41107 - Disclosure - Share capital - At the market equity offering (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalConvertibleNoteAgreementDetails" id="DisclosureShareCapitalConvertibleNoteAgreementDetails">
        <link:definition>41108 - Disclosure - Share capital - Convertible note agreement (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesContractRevenueAttributableToLicensingArrangementsDetails" id="DisclosureContractRevenuesContractRevenueAttributableToLicensingArrangementsDetails">
        <link:definition>41301 - Disclosure - Contract revenues, Contract Revenue Attributable to Licensing Arrangements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesAndOtherOperatingIncomeLicensingAndCollaborationAgreementDetails" id="DisclosureContractRevenuesAndOtherOperatingIncomeLicensingAndCollaborationAgreementDetails">
        <link:definition>41302 - Disclosure - Contract revenues and other operating income - Licensing and collaboration agreement (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesMorphomerTauSmallMolecule2018LicenseAgreementWithEliLillyAndCompanyDetails" id="DisclosureContractRevenuesMorphomerTauSmallMolecule2018LicenseAgreementWithEliLillyAndCompanyDetails">
        <link:definition>41303 - Disclosure - Contract revenues, Morphomer Tau small molecule - 2018 license agreement with Eli Lilly and Company (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesAntiAbetaAntibodyInAd2006AgreementWithGenentechDetails" id="DisclosureContractRevenuesAntiAbetaAntibodyInAd2006AgreementWithGenentechDetails">
        <link:definition>41304 - Disclosure - Contract revenues, Anti-Abeta Antibody in AD - 2006 Agreement with Genentech (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesAntiTauAntibodyInAd2012AgreementWithGenentechDetails" id="DisclosureContractRevenuesAntiTauAntibodyInAd2012AgreementWithGenentechDetails">
        <link:definition>41305 - Disclosure - Contract revenues, Anti-Tau Antibody in AD - 2012 Agreement with Genentech (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesTauVaccineInAd2014AgreementWithJanssenPharmaceuticalsDetails" id="DisclosureContractRevenuesTauVaccineInAd2014AgreementWithJanssenPharmaceuticalsDetails">
        <link:definition>41306 - Disclosure - Contract revenues, Tau Vaccine in AD - 2014 Agreement with Janssen Pharmaceuticals (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesTauPetImagingAgent2014AgreementWithLifeMolecularImagingFormerlyPiramalImagingSaDetails" id="DisclosureContractRevenuesTauPetImagingAgent2014AgreementWithLifeMolecularImagingFormerlyPiramalImagingSaDetails">
        <link:definition>41307 - Disclosure - Contract revenues, Tau-PET imaging agent -2014 Agreement with Life Molecular Imaging (formerly Piramal Imaging SA) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesGrantsFromMichaelJFoxFoundationDetails" id="DisclosureContractRevenuesGrantsFromMichaelJFoxFoundationDetails">
        <link:definition>41308 - Disclosure - Contract revenues - Grants from the Michael J. Fox Foundation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureIncomeTaxesUnrecognizedDeductibleTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCreditsDetails" id="DisclosureIncomeTaxesUnrecognizedDeductibleTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCreditsDetails">
        <link:definition>41602 - Disclosure - Income taxes, Unrecognized Deductible Temporary Differences, Unused Tax Losses and Unused Tax Credits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlanChangesInDefinedBenefitObligationDetails" id="DisclosureRetirementBenefitPlanChangesInDefinedBenefitObligationDetails">
        <link:definition>41703 - Disclosure - Retirement benefit plan, Changes in Defined Benefit Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlanChangesInFairValueOfPlanAssetsDetails" id="DisclosureRetirementBenefitPlanChangesInFairValueOfPlanAssetsDetails">
        <link:definition>41704 - Disclosure - Retirement benefit plan, Changes in Fair Value of Plan Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlanChangeInNetDefinedBenefitLiabilityDetails" id="DisclosureRetirementBenefitPlanChangeInNetDefinedBenefitLiabilityDetails">
        <link:definition>41705 - Disclosure - Retirement benefit plan, Change in Net Defined Benefit Liability (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlanActuarialAssumptionsAndSensitivityAnalysisDetails" id="DisclosureRetirementBenefitPlanActuarialAssumptionsAndSensitivityAnalysisDetails">
        <link:definition>41707 - Disclosure - Retirement benefit plan, Actuarial Assumptions and Sensitivity Analysis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareBasedCompensationPlansOutstandingDetails" id="DisclosureShareBasedCompensationPlansOutstandingDetails">
        <link:definition>41801 - Disclosure - Share-based compensation, Plans Outstanding (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareBasedCompensationOutstandingOptionsRangeOfExercisePricesAndExpirationDatesDetails" id="DisclosureShareBasedCompensationOutstandingOptionsRangeOfExercisePricesAndExpirationDatesDetails">
        <link:definition>41803 - Disclosure - Share-based compensation, Outstanding Options, Range of Exercise prices and Expiration Dates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareBasedCompensationWeightedAverageGrantDateFairValueAndAssumptionsDetails" id="DisclosureShareBasedCompensationWeightedAverageGrantDateFairValueAndAssumptionsDetails">
        <link:definition>41804 - Disclosure - Share-based compensation, Weighted Average Grant date Fair Value and Assumptions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareBasedCompensationNonVestedShareAwardsDetails" id="DisclosureShareBasedCompensationNonVestedShareAwardsDetails">
        <link:definition>41805 - Disclosure - Share-based compensation, Non-vested Share Awards (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureCommitmentsAndContingenciesDetails" id="DisclosureCommitmentsAndContingenciesDetails">
        <link:definition>41901 - Disclosure - Commitments and contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureFinancialInstrumentsAndRiskManagementDetails" id="DisclosureFinancialInstrumentsAndRiskManagementDetails">
        <link:definition>42101 - Disclosure - Financial instruments and risk management (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureGeneralInformation" id="DisclosureGeneralInformation">
        <link:definition>10101 - Disclosure - General information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureBasisOfPreparation" id="DisclosureBasisOfPreparation">
        <link:definition>10201 - Disclosure - Basis of preparation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSummaryOfSignificantAccountingPolicies" id="DisclosureSummaryOfSignificantAccountingPolicies">
        <link:definition>10301 - Disclosure - Summary of significant accounting policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosurePropertyPlantAndEquipment" id="DisclosurePropertyPlantAndEquipment">
        <link:definition>10401 - Disclosure - Property, plant and equipment</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilities" id="DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilities">
        <link:definition>10501 - Disclosure - Right-of-use assets, long-term financial assets and lease liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureAssetAcquisition" id="DisclosureAssetAcquisition">
        <link:definition>10601 - Disclosure - Asset acquisition</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureIntangibleAssets" id="DisclosureIntangibleAssets">
        <link:definition>10701 - Disclosure - Intangible assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureCashAndCashEquivalentsAndShortTermFinancialAssets" id="DisclosureCashAndCashEquivalentsAndShortTermFinancialAssets">
        <link:definition>10801 - Disclosure - Cash and cash equivalents and short-term financial assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosurePrepaidExpensesAndAccruedIncome" id="DisclosurePrepaidExpensesAndAccruedIncome">
        <link:definition>10901 - Disclosure - Prepaid expenses and accrued income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureOtherCurrentReceivables" id="DisclosureOtherCurrentReceivables">
        <link:definition>11001 - Disclosure - Other current receivables</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapital" id="DisclosureShareCapital">
        <link:definition>11101 - Disclosure - Share capital</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureTradeAndOtherPayablesAndAccruedExpenses" id="DisclosureTradeAndOtherPayablesAndAccruedExpenses">
        <link:definition>11201 - Disclosure - Trade and other payables and accrued expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenues" id="DisclosureContractRevenues">
        <link:definition>11301 - Disclosure - Contract revenues</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureExpensesByCategory" id="DisclosureExpensesByCategory">
        <link:definition>11401 - Disclosure - Expenses by category</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRelatedPartyTransactions" id="DisclosureRelatedPartyTransactions">
        <link:definition>11501 - Disclosure - Related-party transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureIncomeTaxes" id="DisclosureIncomeTaxes">
        <link:definition>11601 - Disclosure - Income taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlan" id="DisclosureRetirementBenefitPlan">
        <link:definition>11701 - Disclosure - Retirement benefit plan</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareBasedCompensation" id="DisclosureShareBasedCompensation">
        <link:definition>11801 - Disclosure - Share-based compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureCommitmentsAndContingencies" id="DisclosureCommitmentsAndContingencies">
        <link:definition>11901 - Disclosure - Commitments and contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureEarningsPerShare" id="DisclosureEarningsPerShare">
        <link:definition>12001 - Disclosure - Earnings per share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureFinancialInstrumentsAndRiskManagement" id="DisclosureFinancialInstrumentsAndRiskManagement">
        <link:definition>12101 - Disclosure - Financial instruments and risk management</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureCapitalRiskManagement" id="DisclosureCapitalRiskManagement">
        <link:definition>12201 - Disclosure - Capital risk management</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSubsequentEvents" id="DisclosureSubsequentEvents">
        <link:definition>12301 - Disclosure - Subsequent events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" id="DisclosureSummaryOfSignificantAccountingPoliciesPolicies">
        <link:definition>20302 - Disclosure - Summary of significant accounting policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables" id="DisclosureSummaryOfSignificantAccountingPoliciesTables">
        <link:definition>30303 - Disclosure - Summary of significant accounting policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosurePropertyPlantAndEquipmentTables" id="DisclosurePropertyPlantAndEquipmentTables">
        <link:definition>30403 - Disclosure - Property, plant and equipment (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilitiesTables" id="DisclosureRightOfUseAssetsLongTermFinancialAssetsAndLeaseLiabilitiesTables">
        <link:definition>30503 - Disclosure - Right-of-use assets, long-term financial assets and lease liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureAssetAcquisitionTables" id="DisclosureAssetAcquisitionTables">
        <link:definition>30603 - Disclosure - Asset acquisition (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureIntangibleAssetsTables" id="DisclosureIntangibleAssetsTables">
        <link:definition>30703 - Disclosure - Intangible assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureCashAndCashEquivalentsAndShortTermFinancialAssetsTables" id="DisclosureCashAndCashEquivalentsAndShortTermFinancialAssetsTables">
        <link:definition>30803 - Disclosure - Cash and cash equivalents and short-term financial assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosurePrepaidExpensesAndAccruedIncomeTables" id="DisclosurePrepaidExpensesAndAccruedIncomeTables">
        <link:definition>30903 - Disclosure - Prepaid expenses and accrued income (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureOtherCurrentReceivablesTables" id="DisclosureOtherCurrentReceivablesTables">
        <link:definition>31003 - Disclosure - Other current receivables (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalTables" id="DisclosureShareCapitalTables">
        <link:definition>31103 - Disclosure - Share capital (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureTradeAndOtherPayablesAndAccruedExpensesTables" id="DisclosureTradeAndOtherPayablesAndAccruedExpensesTables">
        <link:definition>31203 - Disclosure - Trade and other payables and accrued expenses (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureContractRevenuesTables" id="DisclosureContractRevenuesTables">
        <link:definition>31303 - Disclosure - Contract revenues (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureExpensesByCategoryTables" id="DisclosureExpensesByCategoryTables">
        <link:definition>31403 - Disclosure - Expenses by category (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRelatedPartyTransactionsTables" id="DisclosureRelatedPartyTransactionsTables">
        <link:definition>31503 - Disclosure - Related-party transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureIncomeTaxesTables" id="DisclosureIncomeTaxesTables">
        <link:definition>31603 - Disclosure - Income taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureRetirementBenefitPlanTables" id="DisclosureRetirementBenefitPlanTables">
        <link:definition>31703 - Disclosure - Retirement benefit plan (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareBasedCompensationTables" id="DisclosureShareBasedCompensationTables">
        <link:definition>31803 - Disclosure - Share-based compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureCommitmentsAndContingenciesTables" id="DisclosureCommitmentsAndContingenciesTables">
        <link:definition>31903 - Disclosure - Commitments and contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureEarningsPerShareTables" id="DisclosureEarningsPerShareTables">
        <link:definition>32003 - Disclosure - Earnings per share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureFinancialInstrumentsAndRiskManagementTables" id="DisclosureFinancialInstrumentsAndRiskManagementTables">
        <link:definition>32103 - Disclosure - Financial instruments and risk management (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureGeneralInformationDetails" id="DisclosureGeneralInformationDetails">
        <link:definition>40101 - Disclosure - General information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureBasisOfPreparationGoingConcernDetails" id="DisclosureBasisOfPreparationGoingConcernDetails">
        <link:definition>40201 - Disclosure - Basis of preparation - Going concern (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSummaryOfSignificantAccountingPoliciesFunctionalAndReportingCurrencyDetails" id="DisclosureSummaryOfSignificantAccountingPoliciesFunctionalAndReportingCurrencyDetails">
        <link:definition>40301 - Disclosure - Summary of significant accounting policies - Functional and reporting currency (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSummaryOfSignificantAccountingPoliciesIncomeTaxesDetails" id="DisclosureSummaryOfSignificantAccountingPoliciesIncomeTaxesDetails">
        <link:definition>40304 - Disclosure - Summary of significant accounting policies, Income taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureSummaryOfSignificantAccountingPoliciesSegmentReportingDetails" id="DisclosureSummaryOfSignificantAccountingPoliciesSegmentReportingDetails">
        <link:definition>40305 - Disclosure - Summary of significant accounting policies, Segment reporting (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureCashAndCashEquivalentsAndFinancialAssetsCashAndCashEquivalentsAndShortTermFinancialAssetsDetails" id="DisclosureCashAndCashEquivalentsAndFinancialAssetsCashAndCashEquivalentsAndShortTermFinancialAssetsDetails">
        <link:definition>40802 - Disclosure - Cash and cash equivalents and financial assets, Cash and cash equivalents and short-term financial assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareCapitalAuthorizedCapitalDetails" id="DisclosureShareCapitalAuthorizedCapitalDetails">
        <link:definition>41103 - Disclosure - Share capital - Authorized capital (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://acimume.com/role/DisclosureShareBasedCompensationWeightedAverageExercisePricesDetails" id="DisclosureShareBasedCompensationWeightedAverageExercisePricesDetails">
        <link:definition>41802 - Disclosure - Share-based compensation, Weighted Average Exercise Prices (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:href="aciu-20221231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="aciu-20221231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="aciu-20221231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="aciu-20221231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:roleType roleURI="http://acimume.com/role/DisclosureStandardAndCustomAxisDomainDefaults" id="DisclosureStandardAndCustomAxisDomainDefaults">
        <link:definition>99900 - Disclosure - Standard And Custom Axis Domain Defaults</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:import namespace="http://xbrl.ifrs.org/taxonomy/2021-03-24/ifrs-full" schemaLocation="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2021q4" schemaLocation="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2021" schemaLocation="https://xbrl.sec.gov/country/2021/country-2021.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/currency/2021" schemaLocation="https://xbrl.sec.gov/currency/2021/currency-2021.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://fasb.org/srt/2021-01-31" schemaLocation="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd" />
  <xsd:element name="OtherCurrentReceivablesAbstract" id="aciu_OtherCurrentReceivablesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfOtherCurrentReceivablesTextBlock" id="aciu_DisclosureOfOtherCurrentReceivablesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpensesOperatingAbstract" id="aciu_ExpensesOperatingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IssueOfEquityRestrictedShareAwards" id="aciu_IssueOfEquityRestrictedShareAwards" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseThroughAcquisitionOfAssetsEquity" id="aciu_IncreaseDecreaseThroughAcquisitionOfAssetsEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseThroughPurchaseOfInProcessResearchAndDevelopmentAsset" id="aciu_IncreaseDecreaseThroughPurchaseOfInProcessResearchAndDevelopmentAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="CashAdvancesForRentDeposit" id="aciu_CashAdvancesForRentDeposit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromIssueOfConvertibleDebt" id="aciu_ProceedsFromIssueOfConvertibleDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RepaymentOfConvertibleDebtEquitySettlementAmount" id="aciu_RepaymentOfConvertibleDebtEquitySettlementAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ChangesInWorkingCapitalAbstract" id="aciu_ChangesInWorkingCapitalAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AdjustmentsForIncreaseDecreaseInAccruedExpenses" id="aciu_AdjustmentsForIncreaseDecreaseInAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AdjustmentsForDepreciationExpenseRightOfUseAssets" id="aciu_AdjustmentsForDepreciationExpenseRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SupplementalNonCashActivityAbstract" id="aciu_SupplementalNonCashActivityAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IssuanceOfSharesForPurchaseOfIPRDAssetInAssetAcquisition" id="aciu_IssuanceOfSharesForPurchaseOfIPRDAssetInAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PurchaseOfPropertyPlantAndEquipmentClassifiedAsNoncashInvestingActivities" id="aciu_PurchaseOfPropertyPlantAndEquipmentClassifiedAsNoncashInvestingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ExpensesByCategoryAbstract" id="aciu_ExpensesByCategoryAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommitmentsAndContingenciesAbstract" id="aciu_CommitmentsAndContingenciesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LaboratoryEquipmentMember" id="aciu_LaboratoryEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageIncreaseInPropertyPlantAndEquipment" id="aciu_PercentageIncreaseInPropertyPlantAndEquipment" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConditionalShareCapitalForEmployeeBenefitPlansMember" id="aciu_ConditionalShareCapitalForEmployeeBenefitPlansMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConditionalShareCapitalAbstract" id="aciu_ConditionalShareCapitalAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PotentialNumberOfSharesIssuedFromShareBasedPaymentTransactions" id="aciu_PotentialNumberOfSharesIssuedFromShareBasedPaymentTransactions" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PotentialIncreaseIsEquityThroughShareBasedPaymentTransactions" id="aciu_PotentialIncreaseIsEquityThroughShareBasedPaymentTransactions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="TaxLossesSplitByExpiryDateAbstract" id="aciu_TaxLossesSplitByExpiryDateAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AtTheMarketEquityOfferingAbstract" id="aciu_AtTheMarketEquityOfferingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommissionsPaidForIssuanceOrdinaryShares" id="aciu_CommissionsPaidForIssuanceOrdinaryShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CommonSharesAuthorizedForIssuanceSalesInInOpenMarket" id="aciu_CommonSharesAuthorizedForIssuanceSalesInInOpenMarket" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AtTheMarketEquityOfferingMember" id="aciu_AtTheMarketEquityOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SecondOpenMarketSalesAgreementMember" id="aciu_SecondOpenMarketSalesAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOrIssueOfTreasurySharesShares" id="aciu_SaleOrIssueOfTreasurySharesShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfOtherCurrentReceivablesTable" id="aciu_DisclosureOfOtherCurrentReceivablesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfOtherCurrentReceivablesLineItems" id="aciu_DisclosureOfOtherCurrentReceivablesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfContractualUndiscountedCashFlowsTableTextBlock" id="aciu_ScheduleOfContractualUndiscountedCashFlowsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfRightOfUseAssetsImpactOnStatementsTextBlock" id="aciu_DisclosureOfRightOfUseAssetsImpactOnStatementsTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ImpactOnStatementsOfIncomeLossAndCashFlowsAbstract" id="aciu_ImpactOnStatementsOfIncomeLossAndCashFlowsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ContractualUndiscountedCashFlowsForLeaseLiabilitiesAbstract" id="aciu_ContractualUndiscountedCashFlowsForLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EscrowDepositAmount" id="aciu_EscrowDepositAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfDepositsInEscrowAccounts" id="aciu_NumberOfDepositsInEscrowAccounts" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RightOfUseLeasedAssetsAbstract" id="aciu_RightOfUseLeasedAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DispositionsOfRightOfUseAssets" id="aciu_DispositionsOfRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ExpenseRelatingToLeases" id="aciu_ExpenseRelatingToLeases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CollaborationAndLicenseRevenueAgreementsMember" id="aciu_CollaborationAndLicenseRevenueAgreementsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborationAgreementOf2012GenentechMember" id="aciu_CollaborationAgreementOf2012GenentechMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborationAgreementWithLillyMember" id="aciu_CollaborationAgreementWithLillyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ContractRevenueAbstract" id="aciu_ContractRevenueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LicenseAndCollaborationAgreementOf2014LifeMolecularImagingMember" id="aciu_LicenseAndCollaborationAgreementOf2014LifeMolecularImagingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborationAgreementOf2014JanssenPharmaceuticalsMember" id="aciu_CollaborationAgreementOf2014JanssenPharmaceuticalsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborativeAgreementMilestonePaymentReceived" id="aciu_CollaborativeAgreementMilestonePaymentReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CollaborativeAgreementPotentialValue" id="aciu_CollaborativeAgreementPotentialValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="CollaborativeAgreementNoticeOfContractTerminationPeriod" id="aciu_CollaborativeAgreementNoticeOfContractTerminationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AntiAbetaAntibodyInADMember" id="aciu_AntiAbetaAntibodyInADMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborativeAgreementCumulativePaymentsReceived" id="aciu_CollaborativeAgreementCumulativePaymentsReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CollaborationAgreementOf2006GenentechMember" id="aciu_CollaborationAgreementOf2006GenentechMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfMilestonePaymentsReceived" id="aciu_NumberOfMilestonePaymentsReceived" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborativeAgreementJointResearchCollaborationPeriod" id="aciu_CollaborativeAgreementJointResearchCollaborationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SkaneUniversityHospitalMember" id="aciu_SkaneUniversityHospitalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrantRevenueMember" id="aciu_GrantRevenueMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrantsMichaelJFoxFoundationMember" id="aciu_GrantsMichaelJFoxFoundationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfGrants" id="aciu_NumberOfGrants" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfRepresentativesInJointSteeringCommitteeByEachParty" id="aciu_NumberOfRepresentativesInJointSteeringCommitteeByEachParty" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborativeAgreementMilestonePaymentNumberOfInstallments" id="aciu_CollaborativeAgreementMilestonePaymentNumberOfInstallments" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TauMorphomerSmallMoleculeMember" id="aciu_TauMorphomerSmallMoleculeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RightOfUseLicenseMember" id="aciu_RightOfUseLicenseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ResearchAndDevelopmentMember" id="aciu_ResearchAndDevelopmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MilestonePaymentsClinicalAndRegulatoryMilestonesMember" id="aciu_MilestonePaymentsClinicalAndRegulatoryMilestonesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MilestonePaymentsCommercialMember" id="aciu_MilestonePaymentsCommercialMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborationAgreementWithLillyFirstAmendmentMember" id="aciu_CollaborationAgreementWithLillyFirstAmendmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CollaborationAgreementWithLillySecondAmendmentMember" id="aciu_CollaborationAgreementWithLillySecondAmendmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BasisOfPreparationAbstract" id="aciu_BasisOfPreparationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GoingConcernAbstract" id="aciu_GoingConcernAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfDetailedInformationAboutIncomeTaxReconciliationTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutIncomeTaxReconciliationTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfDetailedInformationAboutIncomeTaxLossesExpiryTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutIncomeTaxLossesExpiryTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AntidilutiveSecuritiesAbstract" id="aciu_AntidilutiveSecuritiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DilutiveEffectOfRestrictedShareAwardsSubjectToFutureVesting" id="aciu_DilutiveEffectOfRestrictedShareAwardsSubjectToFutureVesting" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DilutiveEffectOfShareOptionsIssuedAndOutstanding" id="aciu_DilutiveEffectOfShareOptionsIssuedAndOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DilutiveEffectOfShareOptionsAndConvertibleInstrumentsOnNumberOfOrdinaryShares" id="aciu_DilutiveEffectOfShareOptionsAndConvertibleInstrumentsOnNumberOfOrdinaryShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TauVaccineInADMember" id="aciu_TauVaccineInADMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GeneralInformationAbstract" id="aciu_GeneralInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfGeneralInformationAboutTheEntityExplanatoryTextBlock" id="aciu_DisclosureOfGeneralInformationAboutTheEntityExplanatoryTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfTechnologyPlatforms" id="aciu_NumberOfTechnologyPlatforms" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ConvertibleNoteAgreementAbstract" id="aciu_ConvertibleNoteAgreementAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AthosServiceGmbHMember" id="aciu_AthosServiceGmbHMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseInNumberOfOrdinarySharesIssuedUnderConversionOfConvertibleDebt" id="aciu_IncreaseInNumberOfOrdinarySharesIssuedUnderConversionOfConvertibleDebt" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConvertibleNoteAgreementMember" id="aciu_ConvertibleNoteAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FirstCapitalPartnerGmbHMember" id="aciu_FirstCapitalPartnerGmbHMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancialResultNetAbstract" id="aciu_FinancialResultNetAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfInformationAboutCommitmentsAndContingenciesTable" id="aciu_DisclosureOfInformationAboutCommitmentsAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfInformationAboutCommitmentsAndContingenciesLineItems" id="aciu_DisclosureOfInformationAboutCommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommitmentsAbstract" id="aciu_CommitmentsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RentalContractPeriodForNoticeOfCancellation" id="aciu_RentalContractPeriodForNoticeOfCancellation" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageAssumptionsAbstract" id="aciu_WeightedAverageAssumptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveGainsLossesAbstract" id="aciu_OtherComprehensiveGainsLossesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EstimatedLeaseTerm" id="aciu_EstimatedLeaseTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LeaseholdImprovementsAndFixturesAndFittingsMember" id="aciu_LeaseholdImprovementsAndFixturesAndFittingsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PropertyPlantAndEquipmentEstimatedUsefulLifeAbstract" id="aciu_PropertyPlantAndEquipmentEstimatedUsefulLifeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingSegmentsNumber" id="aciu_OperatingSegmentsNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReportableSegmentsNumber" id="aciu_ReportableSegmentsNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfInformationAboutContractLeaseTermByRightOfUseAssetCategoriesTableTextBlock" id="aciu_ScheduleOfInformationAboutContractLeaseTermByRightOfUseAssetCategoriesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfInformationAboutPropertyPlantAndEquipmentUsefulLifeTableTextBlock" id="aciu_ScheduleOfInformationAboutPropertyPlantAndEquipmentUsefulLifeTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TauPETImagingAgentMember" id="aciu_TauPETImagingAgentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TradeAndOtherPayablesAndAccruedLiabilitiesTable" id="aciu_TradeAndOtherPayablesAndAccruedLiabilitiesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TradeAndOtherPayablesAndAccruedLiabilitiesLineItems" id="aciu_TradeAndOtherPayablesAndAccruedLiabilitiesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedStampDuty" id="aciu_AccruedStampDuty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CurrentAccruedResearchAndDevelopmentCosts" id="aciu_CurrentAccruedResearchAndDevelopmentCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfPersonsKeyManagementBoardOfDirectors" id="aciu_NumberOfPersonsKeyManagementBoardOfDirectors" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPersonsKeyManagementExecutiveManagement" id="aciu_NumberOfPersonsKeyManagementExecutiveManagement" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DilutiveEffectOfConvertibleInstrumentsTextBlock" id="aciu_DilutiveEffectOfConvertibleInstrumentsTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfDetailedInformationAboutTradePayablesAndAccruedLiabilitiesTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutTradePayablesAndAccruedLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfNonVestedSharesAbstract" id="aciu_NumberOfNonVestedSharesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfOtherEquityInstrumentsExercisedInShareBasedPaymentArrangement" id="aciu_NumberOfOtherEquityInstrumentsExercisedInShareBasedPaymentArrangement" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedPaymentArrangementAbstract" id="aciu_ShareBasedPaymentArrangementAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumTermOfOtherEquityInstrumentsGrantedForShareBasedPaymentArrangement" id="aciu_MaximumTermOfOtherEquityInstrumentsGrantedForShareBasedPaymentArrangement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestrictedStockUnitsMember" id="aciu_RestrictedStockUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BoardOfDirectorsMember" id="aciu_BoardOfDirectorsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VestingRequirementsForShareBasedPaymentArrangementAwardVestingPeriod" id="aciu_VestingRequirementsForShareBasedPaymentArrangementAwardVestingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExecutiveManagementMember" id="aciu_ExecutiveManagementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageExercisePriceAbstract" id="aciu_WeightedAverageExercisePriceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestrictedSharesAndRestrictedShareUnitsMember" id="aciu_RestrictedSharesAndRestrictedShareUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SensitivityAnalysisActuarialAssumptionsAbstract" id="aciu_SensitivityAnalysisActuarialAssumptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfReasonablyPossibleDecreaseInActuarialAssumptionMember" id="aciu_PercentageOfReasonablyPossibleDecreaseInActuarialAssumptionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfReasonablyPossibleIncreaseInActuarialAssumptionMember" id="aciu_PercentageOfReasonablyPossibleIncreaseInActuarialAssumptionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ChangesInFairValueOfPlanAssetsAbstract" id="aciu_ChangesInFairValueOfPlanAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AntiTauAntibodyInADMember" id="aciu_AntiTauAntibodyInADMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfOptionsAbstract" id="aciu_NumberOfOptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageRemainingAbstract" id="aciu_WeightedAverageRemainingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancialAssetsAndLiabilitiesAbstract" id="aciu_FinancialAssetsAndLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedExpensesMember" id="aciu_AccruedExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TradeAndOtherPayablesMember" id="aciu_TradeAndOtherPayablesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FinancialRisksAbstract" id="aciu_FinancialRisksAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LiquidityManagementRollingForecastPeriod" id="aciu_LiquidityManagementRollingForecastPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfFinancialInstitutionsHoldingCashAndCashEquivalentsAndShortTermFinancialAssets" id="aciu_NumberOfFinancialInstitutionsHoldingCashAndCashEquivalentsAndShortTermFinancialAssets" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermFinancialAssetsMember" id="aciu_LongTermFinancialAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashOnHandAndCashEquivalentsMember" id="aciu_CashOnHandAndCashEquivalentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortTermFinancialAssetsMember" id="aciu_ShortTermFinancialAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortTermLeaseLiabilitiesMember" id="aciu_ShortTermLeaseLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RightOfUseFinancialAssetsMember" id="aciu_RightOfUseFinancialAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfDetailedInformationAboutCarryingAmountsOfFinancialAssetsAndFinancialLiabilitiesTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutCarryingAmountsOfFinancialAssetsAndFinancialLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OutstandingOptionsExercisePriceRangeAndExpiryDatesAbstract" id="aciu_OutstandingOptionsExercisePriceRangeAndExpiryDatesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfEquityBasedInstrumentPlans" id="aciu_NumberOfEquityBasedInstrumentPlans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockOptionPlanC1Member" id="aciu_StockOptionPlanC1Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Two016ShareOptionAndIncentivePlanMember" id="aciu_Two016ShareOptionAndIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Two016ShareOptionAndIncentivePlanVestingTrancheOneMember" id="aciu_Two016ShareOptionAndIncentivePlanVestingTrancheOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Two016ShareOptionAndIncentivePlanVestingTrancheTwoMember" id="aciu_Two016ShareOptionAndIncentivePlanVestingTrancheTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedPlansOutstandingAbstract" id="aciu_ShareBasedPlansOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumTermOfOptionsGrantedForShareBasedPaymentArrangement" id="aciu_MaximumTermOfOptionsGrantedForShareBasedPaymentArrangement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeesMember" id="aciu_EmployeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Two016ShareOptionAndIncentivePlanVestingTrancheThreeMember" id="aciu_Two016ShareOptionAndIncentivePlanVestingTrancheThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxLossCarryforwardPeriod" id="aciu_IncomeTaxLossCarryforwardPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrepaidExpensesAndAccruedIncomeTable" id="aciu_PrepaidExpensesAndAccruedIncomeTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrepaidExpensesAndAccruedIncomeLineItems" id="aciu_PrepaidExpensesAndAccruedIncomeLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrepaidExpensesAndAccruedIncomeDisclosureAbstract" id="aciu_PrepaidExpensesAndAccruedIncomeDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfAccruedIncome" id="aciu_PercentageOfAccruedIncome" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DisclosureOfAccountingPolicyForChangesInAccountingPoliciesRecentlyAdoptedTextBlock" id="aciu_DisclosureOfAccountingPolicyForChangesInAccountingPoliciesRecentlyAdoptedTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DescriptionOfAccountingPolicyForAccountingJudgmentsAndEstimatesPolicyTextBlock" id="aciu_DescriptionOfAccountingPolicyForAccountingJudgmentsAndEstimatesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrantIncomePolicyTextBlock" id="aciu_GrantIncomePolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DescriptionOfAccountingPolicyForClassificationOfAssetsAndLiabilitiesPolicyTextBlock" id="aciu_DescriptionOfAccountingPolicyForClassificationOfAssetsAndLiabilitiesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashAndCashEquivalentsTable" id="aciu_CashAndCashEquivalentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashAndCashEquivalentLineItems" id="aciu_CashAndCashEquivalentLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InProcessResearchAndDevelopmentIPRDAssetMember" id="aciu_InProcessResearchAndDevelopmentIPRDAssetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConditionalShareCapitalForBondsAndSimilarDebtInstrumentsMember" id="aciu_ConditionalShareCapitalForBondsAndSimilarDebtInstrumentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseInNumberOfOrdinarySharesIssuedUnderIncentivePlans" id="aciu_IncreaseInNumberOfOrdinarySharesIssuedUnderIncentivePlans" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseThroughTreasuryShareTransactionsEquityShares" id="aciu_IncreaseDecreaseThroughTreasuryShareTransactionsEquityShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseThroughSharesIssuedUnderIncentivePlans" id="aciu_IncreaseThroughSharesIssuedUnderIncentivePlans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DisclosureOfDetailedInformationAboutOtherCurrentReceivablesTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutOtherCurrentReceivablesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PaymentsProceedsFromPurchasesSalesOfShortTermFinancialAssetsClassifiedAsInvestingActivities" id="aciu_PaymentsProceedsFromPurchasesSalesOfShortTermFinancialAssetsClassifiedAsInvestingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="WithholdingTaxReceivables" id="aciu_WithholdingTaxReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AccruedExpensesAbstract" id="aciu_AccruedExpensesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetsUnderConstructionMember" id="aciu_AssetsUnderConstructionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AlphaSynucleinPetImagingDiagnosticAgentMember" id="aciu_AlphaSynucleinPetImagingDiagnosticAgentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="FollowOnGrantFundingReceived" id="aciu_FollowOnGrantFundingReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="FollowOnGrantFundingReceivedTotalForJointArrangement" id="aciu_FollowOnGrantFundingReceivedTotalForJointArrangement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ProceedsFromSaleOfTreasurySharesInPublicOfferingsNetOfUnderwritingFeesAndTransactionCosts" id="aciu_ProceedsFromSaleOfTreasurySharesInPublicOfferingsNetOfUnderwritingFeesAndTransactionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ProceedsFromIssuanceOfTreasurySharesNetOfUnderwritingFeesAndTransactionCosts" id="aciu_ProceedsFromIssuanceOfTreasurySharesNetOfUnderwritingFeesAndTransactionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PaymentsForShareIssueCostsAssociatedWithIssuanceOfSharesInRelationToAssetAcquisitions" id="aciu_PaymentsForShareIssueCostsAssociatedWithIssuanceOfSharesInRelationToAssetAcquisitions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AssetAcquisitionsAxis" id="aciu_AssetAcquisitionsAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SignificantAssetAcquisitionsTotalDomain" id="aciu_SignificantAssetAcquisitionsTotalDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CashAcquiredAsPartOfAssetAcquisition" id="aciu_CashAcquiredAsPartOfAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="IntangibleAssetsAcquiredAsPartOfAssetAcquisition" id="aciu_IntangibleAssetsAcquiredAsPartOfAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TotalAssetsAcquiredInAssetAcquisition" id="aciu_TotalAssetsAcquiredInAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="SharesTransferredAsConsiderationInAssetAcquisition" id="aciu_SharesTransferredAsConsiderationInAssetAcquisition" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TotalConsiderationTransferredAcquisitionDateFairValueAssetAcquisition" id="aciu_TotalConsiderationTransferredAcquisitionDateFairValueAssetAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="IprDIntangibleAssetAssociatedWithAci7104.056Member" id="aciu_IprDIntangibleAssetAssociatedWithAci7104.056Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AssetAcquisitionsAbstract" id="aciu_AssetAcquisitionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SignificantAssetAcquisitionsAxis" id="aciu_SignificantAssetAcquisitionsAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AllSignificantAssetAcquisitionsDomain" id="aciu_AllSignificantAssetAcquisitionsDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ProgramPortfolioOfTherapeuticsTargetingAsynFromAffirisMember" id="aciu_ProgramPortfolioOfTherapeuticsTargetingAsynFromAffirisMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="MiscellaneousOtherCurrentReceivables" id="aciu_MiscellaneousOtherCurrentReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="MaturityPeriodOtherCurrentReceivables" id="aciu_MaturityPeriodOtherCurrentReceivables" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ReconciliationOfNumberOfTreasurySharesOutstandingAbstract" id="aciu_ReconciliationOfNumberOfTreasurySharesOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="IncreaseInNumberOfSharesThroughIssuanceAsConsiderationInAssetAcquisitions" id="aciu_IncreaseInNumberOfSharesThroughIssuanceAsConsiderationInAssetAcquisitions" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DecreaseInNumberOfTreasurySharesFromSalesOrIssuance" id="aciu_DecreaseInNumberOfTreasurySharesFromSalesOrIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="IncreaseThroughIssuanceOfSharesInAssetAcquisitions" id="aciu_IncreaseThroughIssuanceOfSharesInAssetAcquisitions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="NumberOfAdditionalSharesThatBoardOfDirectorsAreAuthorizedToIssue" id="aciu_NumberOfAdditionalSharesThatBoardOfDirectorsAreAuthorizedToIssue" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="AdditionalShareCapitalThatBoardOfDirectorsAreAuthorizedToIssue" id="aciu_AdditionalShareCapitalThatBoardOfDirectorsAreAuthorizedToIssue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PotentialIncreaseIsEquityThroughConversionOfDebtInstruments" id="aciu_PotentialIncreaseIsEquityThroughConversionOfDebtInstruments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PotentialNumberOfSharesIssuedFromConversionOfDebtInstruments" id="aciu_PotentialNumberOfSharesIssuedFromConversionOfDebtInstruments" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="CapitalAuthorizedToBeIssuedUnderShelfRegistrationStatement" id="aciu_CapitalAuthorizedToBeIssuedUnderShelfRegistrationStatement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="NumberOfConvertibleNoteAgreements" id="aciu_NumberOfConvertibleNoteAgreements" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="IfNotesAreConvertedMember" id="aciu_IfNotesAreConvertedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AggregatePrincipalAmountOfEachConvertibleNote" id="aciu_AggregatePrincipalAmountOfEachConvertibleNote" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ProceedsFromConversionOfConvertibleDebtPerIndividualNote" id="aciu_ProceedsFromConversionOfConvertibleDebtPerIndividualNote" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="OutstandingEquityOrCashConsiderationDueUnderConvertibleNoteAgreements" id="aciu_OutstandingEquityOrCashConsiderationDueUnderConvertibleNoteAgreements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="OtherAccruedExpenses" id="aciu_OtherAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AccrualsForPerformanceRelatedRemuneration" id="aciu_AccrualsForPerformanceRelatedRemuneration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="Quarter32019Member" id="aciu_Quarter32019Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="March312020Member" id="aciu_March312020Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="UponFirstPatientDosedInPhase2ClinicalStudyOfLicensedProductInU.s.OrEu.Member" id="aciu_UponFirstPatientDosedInPhase2ClinicalStudyOfLicensedProductInU.s.OrEu.Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CollaborativeAgreementUpfrontPaymentsReceived" id="aciu_CollaborativeAgreementUpfrontPaymentsReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ClinicalMilestonesAchievedPriorTo1January2017Member" id="aciu_ClinicalMilestonesAchievedPriorTo1January2017Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CollaborativeAgreementNoticeOfContractTerminationPeriodInCaseOfMaterialBreachOfContract" id="aciu_CollaborativeAgreementNoticeOfContractTerminationPeriodInCaseOfMaterialBreachOfContract" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ClinicalMilestonesMember" id="aciu_ClinicalMilestonesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RegulatoryAndSalesBasedMilestonesMember" id="aciu_RegulatoryAndSalesBasedMilestonesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AdvanceSmallMoleculePdProgramsMember" id="aciu_AdvanceSmallMoleculePdProgramsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ResearchAndDevelopmentExpensesMember" id="aciu_ResearchAndDevelopmentExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="EmployeeBenefitsExpenseExcludingShareBasedCompensation" id="aciu_EmployeeBenefitsExpenseExcludingShareBasedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="GainsLossesOnConversionFeaturesRelatedToConvertibleNotes" id="aciu_GainsLossesOnConversionFeaturesRelatedToConvertibleNotes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="TaxEffectOfIncomeNotSubjectToTaxAndExpensesNotDeductibleForTaxPurposes" id="aciu_TaxEffectOfIncomeNotSubjectToTaxAndExpensesNotDeductibleForTaxPurposes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="RightOfUseAssetsAndLeaseLiabilitiesNetMember" id="aciu_RightOfUseAssetsAndLeaseLiabilitiesNetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RetirementBenefitPlanMember" id="aciu_RetirementBenefitPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="December312024Member" id="aciu_December312024Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="December312025Member" id="aciu_December312025Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="December312026Member" id="aciu_December312026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="December312027Member" id="aciu_December312027Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="December312028Member" id="aciu_December312028Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="December312029Member" id="aciu_December312029Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="IncreaseDecreaseInTaxLossesAvailableForOffsetAgainstFutureTaxableProfits" id="aciu_IncreaseDecreaseInTaxLossesAvailableForOffsetAgainstFutureTaxableProfits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DefinedBenefitPlansPercentageOfContributionsByEmployees" id="aciu_DefinedBenefitPlansPercentageOfContributionsByEmployees" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DefinedBenefitPlansPercentageOfContributionsByEmployer" id="aciu_DefinedBenefitPlansPercentageOfContributionsByEmployer" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="CurrentAndPastServiceCostGainDefinedBenefitPlans" id="aciu_CurrentAndPastServiceCostGainDefinedBenefitPlans" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="IncreaseDecreaseInNetDefinedBenefitLiabilityAssetResultingFromCurrentAndPastServiceCostsIncome" id="aciu_IncreaseDecreaseInNetDefinedBenefitLiabilityAssetResultingFromCurrentAndPastServiceCostsIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="IncreaseDecreaseInNetDefinedBenefitLiabilityAssetResultingFromBenefitsDeposited" id="aciu_IncreaseDecreaseInNetDefinedBenefitLiabilityAssetResultingFromBenefitsDeposited" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ActuarialAssumptionOfInterestRateOnRetirementSavingsCapital" id="aciu_ActuarialAssumptionOfInterestRateOnRetirementSavingsCapital" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="ActuarialAssumptionOfInterestRateOnSavingsCapitalMember" id="aciu_ActuarialAssumptionOfInterestRateOnSavingsCapitalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="WeightedAverageRemainingContractualLifeOfShareOptionsExercisable" id="aciu_WeightedAverageRemainingContractualLifeOfShareOptionsExercisable" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="Chf0.15Member" id="aciu_Chf0.15Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="Chf9.53Member" id="aciu_Chf9.53Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="Usd5.04ToUsd12.30Member" id="aciu_Usd5.04ToUsd12.30Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="Usd2.76ToUsd4.57Member" id="aciu_Usd2.76ToUsd4.57Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RestrictedStockUnitsFirstVestingConditionsMember" id="aciu_RestrictedStockUnitsFirstVestingConditionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RestrictedStockUnitsSecondVestingConditionsMember" id="aciu_RestrictedStockUnitsSecondVestingConditionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsOutstanding" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsOutstanding" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsForfeited" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsForfeited" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsExpired" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsExpired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsExercised" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsExercised" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsGranted" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsGranted" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsVested" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsVested" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="WeightedAverageGrantDateFairValueOtherEquityInstrumentsVestedAndExercisable" id="aciu_WeightedAverageGrantDateFairValueOtherEquityInstrumentsVestedAndExercisable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ContractualCapitalCommitmentsOtherThanForLeases" id="aciu_ContractualCapitalCommitmentsOtherThanForLeases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="OtherCurrentReceivablesMember" id="aciu_OtherCurrentReceivablesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LongTermLeaseLiabilitiesMember" id="aciu_LongTermLeaseLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PercentageOfReasonablyPossibleStrengtheningOrWeakeningOfReportingCurrencyAgainstOtherRelevantCurrencies" id="aciu_PercentageOfReasonablyPossibleStrengtheningOrWeakeningOfReportingCurrencyAgainstOtherRelevantCurrencies" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PercentageOfReasonablyPossibleIncreaseOrDecreaseInInterestRates" id="aciu_PercentageOfReasonablyPossibleIncreaseOrDecreaseInInterestRates" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="IncreaseDecreaseInProfitLossResultingFromReasonablyPossibleStrengtheningOrWeakeningOfReportingCurrencyAgainstOtherRelevantCurrencies" id="aciu_IncreaseDecreaseInProfitLossResultingFromReasonablyPossibleStrengtheningOrWeakeningOfReportingCurrencyAgainstOtherRelevantCurrencies" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="IncreaseDecreaseInProfitLossResultingFromReasonablyPossibleIncreaseOrDecreaseInInterestRates" id="aciu_IncreaseDecreaseInProfitLossResultingFromReasonablyPossibleIncreaseOrDecreaseInInterestRates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="CashAndCashEquivalentsSubjectToNegativeInterestRates" id="aciu_CashAndCashEquivalentsSubjectToNegativeInterestRates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DisclosureOfAssetAcquisitionsTextBlock" id="aciu_DisclosureOfAssetAcquisitionsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DisclosureOfAssetAcquisitionsTableTextBlock" id="aciu_DisclosureOfAssetAcquisitionsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ScheduleOfCashAndCashEquivalentsByCurrencyTableTextBlock" id="aciu_ScheduleOfCashAndCashEquivalentsByCurrencyTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DisclosureOfAmountsRecognisedInBalanceSheetFromDefinedBenefitPlansTableTextBlock" id="aciu_DisclosureOfAmountsRecognisedInBalanceSheetFromDefinedBenefitPlansTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DisclosureOfAmountsRecognisedInStatementOfProfitAndLossFromDefinedBenefitPlansTableTextBlock" id="aciu_DisclosureOfAmountsRecognisedInStatementOfProfitAndLossFromDefinedBenefitPlansTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DisclosureOfAmountsRecognisedInStatementOfOtherComprehensiveIncomeFromDefinedBenefitPlansTableTextBlock" id="aciu_DisclosureOfAmountsRecognisedInStatementOfOtherComprehensiveIncomeFromDefinedBenefitPlansTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="GrantsMichaelJ.FoxFoundationAndTargetAlsMember" id="aciu_GrantsMichaelJ.FoxFoundationAndTargetAlsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SaleOrIssueOfTreasurySharesNetOfUnderwritingFeesAndTransactionCosts" id="aciu_SaleOrIssueOfTreasurySharesNetOfUnderwritingFeesAndTransactionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DisclosureOfCashAndCashEquivalentsAndShortTermDepositsNotClassifiedAsCashEquivalentsTextBlock" id="aciu_DisclosureOfCashAndCashEquivalentsAndShortTermDepositsNotClassifiedAsCashEquivalentsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ScheduleOfShortTermDepositsNotClassifiedAsCashEquivalentsTableTextBlock" id="aciu_ScheduleOfShortTermDepositsNotClassifiedAsCashEquivalentsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DisclosureOfTradeAndOtherPayablesAndAccruedExpensesTextBlock" id="aciu_DisclosureOfTradeAndOtherPayablesAndAccruedExpensesTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DisclosureOfPrepaidExpensesAndAccruedIncomeIncludingContractAssetsTextBlock" id="aciu_DisclosureOfPrepaidExpensesAndAccruedIncomeIncludingContractAssetsTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DisclosureOfDetailedInformationAboutPrepaidExpensesAndAccruedIncomeIncludingContractAssetsTableTextBlock" id="aciu_DisclosureOfDetailedInformationAboutPrepaidExpensesAndAccruedIncomeIncludingContractAssetsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
</xsd:schema>
