Is there any update on this issue?
The issue with Galaxy crashing the game when attempting to unlock GOG Achievements seems to be fixed but not all of the Achievements seem to be working at all in my case, even I've meet the requirements to unlock the Achievement in question. For one of the Achievements that didn't unlock for me at all was the early BFG-9000 about halfway into the game, I got the access code legitimately through gameplay then inputed the door code and picked up the BFG from there but the Achievement didn't unlock at all. I've even tried going back to an earlier save and much more earlier one with save before the level to start the level that had the early BFG over and still nothing unlocked. UPDATE:
The Super Turbo Turkey Puncher 3 Achievement still crashes the game... UPDATE 2:
Nope, crashing issues (e.g. clearing a stage in Doom 1 and the aforementioned crash in the Super Turbo Turkey Puncher mini-game) from before are back which is strange since I just gotten the Achievements from beating the main game... UPDATE 3:
I'm starting to suspect that console command seta net_useplatformbackend "0" placed in default.cfg might be also the cause of the crashes but without this, there's no way to play multiplayer, and I've tried to go back for the Achievements I was refering with Super Turkey Puncher and I got the "Achivements are disabled" message dispite that I have the console completely off.