Finished the game yesterday. Everything unlocked normally as I progressed through the game. It appears the initial fix did the trick.

I'm not sure if it's a similar problem, or a brand new one, but some of the achievements are not showing up as unlocked for me. What makes this even stranger is that I got the "popups" for them saying that they've been unlocked in game, but they're not showing up in Galaxy or the website.

The two in question are "Unbreakable Will" and "Love Tap".

I tried triggering them again, by restoring an earlier save backup, but this time there was no pop-up at all. It's really strange.

I have a feeling it may be an issue with GOG rather than the game in this case...


[Edit01] Ok, they have appeared after several hours. It's as if there was some delay and the "achievement cache" or something got uploaded much later.