Ah, thanks for the reply, hopefully they follow up with you guys regarding their API.I think this would answer your question: https://forums.exophase.com/threads...ames-integrate-to-exophase.48196/#post-258125
But tl;dr: Their achievements system is still in development and we're waiting for API access.
As far as I'm aware, achievements support right now is limited to a small number of games and can only be accessed by looking through your overlay after opening the game, there's no public profile page available.
I think this page is mostly up-to-date: https://docs.google.com/spreadsheets/d/19f1P5wvCu7sHQHj0JpUNecwnyNoLGdmNjTGIv6YLFe8/edit#gid=0