I believe I have a reproduction. I can't test directly because I don't have a way to re-obtain the achievement but I'm able to verify that the Steam/ubuntu12_32/gameoverlayui process fails to run after making seemingly any change to included mods. Together with the info I observed in https://forums....

Updated to 2.0.8 via steam on linux, started a new game. Game unresponsive to input immediately upon receiving the "steam power" achievement. This is the first achievement I earned since updating to 2.0.8. I've attached the log. I also see the main thread is hung inside Steam's gameoverlay...