All achieved Steam achievement unlocks once entered to the lobby room.
If it isn't working, try update or reinstall to make sure it's V1.04
Best Regards,
MenZ Studio
Fixed V1.04 - Steam Achievement not working
Source: Steam Community (opens in a new tab)
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.