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Achievement-Watcher
Discontinued A sexy achievement file parser with real-time notification, automatic screenshot and playtime tracking. View every achievements earned on your PC whether it's coming from Steam, a Steam emulator, and more.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Since you've replaced the original steam_api64.dll with a steam emulator, you'd have to add it as a Non-Steam game. Then it'd show a play button, but I don't think game tracking and achievements will work unless you add achievement watcher to your list of installed apps.