Quick answer: To open a DACPAC in Visual Studio, create a SQL database project and use Import > Data-tier Application (*.dacpac). Visual Studio/SSDT converts the DACPAC schema into SQL project files that you can inspect and edit. Microsoft documents this as a supported way to unpack a DACPAC.
A DACPAC is a portable database model package used to deploy database schema. You can import it into a SQL project to review its database objects before deployment.
Prerequisites
Prerequisite:
Install Visual Studio with SQL Server Data Tools (SSDT) and the SQL database project tooling required for your Visual Studio version.
1. Create a SQL database project
Open Visual Studio, select File > New > Project, and create a SQL Server Database Project.
Provide a project name and select OK to create the blank project.
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2. Import the DACPAC
In Solution Explorer, right-click the empty database project and select Import > Data-tier Application (*.dacpac).
Browse to the .dacpac file and start the import.
After the import completes, the database objects from the DACPAC are added to the project.
Pro tips:
Review the contents of a DACPAC before deploying it, especially when it comes from an unknown or untrusted source. Microsoft also documents SqlPackage and other options for unpacking a DACPAC.
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