Not sure what happened, but all of a sudden, all the achievements that I've unlocked but were still showing up in grey, now appear as unlocked yay! Even more, all of those that were "secret achievement" are now revealed so.... solved?? Let's see when I unlock my next achievement

Same problem still appears. Many achievements I definitely unlocked (they even showed up in my timeline) appear unlocked in the list and also on external achievement trackers.

Resetting any settings or files from Galaxy did not fix anything because I just got a new computer and all the old ones stayed locked as well as new ones not unlocking

Still happening in September 2025. Sometimes they show. Sometimes they don't. I might just wait for a good steam sale. A big part of the appeal of GOG is that the games just work. This should have been addressed by now to the point we shouldn't have to rename or move files every time. I still enjoy the game, but this needs to be fixed.

I've been having the same issue with some achievements in Tomb Raider I-III Remastered. I unlocked them but some days they just disappear from my progress tab, then they re-appear. I contacted GOG support, and they tried to help me, but the issue persists. I also told them about the overlay not working and apparently, it's a technical issue they can't fix.