One of the game packages that I maintain in Fedora, alienarena, had a new release.
AlienArena is a pretty cool open source 3d FPS game, it has been around for a while, but many people may not be aware of it. There is a Linux Native client and server package, so if you like FPS games, perhaps give it a try?
Is the Steam source separate from the open source version? I noticed it has Steam achievements but I didn’t see anything in the repository I looked at. I ask because I created Gamerzilla, an open source game achievement system. If a game already has achievements, it generally isn’t that hard to modify it to support Gamerzilla.
I understand that you don’t build the steam version. Someone has a github copy of the code and I did a search for SetAchievement but it doesn’t find any calls to it. I guess I’ll need to download the source and take a look.