I finished the game and I just unlock the achievement: "Sergent", "1" and "2" . Even in game I have those unlocked

Yeah, achievements seem to be bugged for me too. I got like 7 of them and then none of them unlocked anymore.

Interestingly, when I unlock an achievement in-game now, it's displayed correctly on the in-game achievements screen, but doesn't unlock in Galaxy. If I then leave the game and start it again via Galaxy, the in-game achievements screen only shows those achievements I've previously unlocked in Galaxy - not the ones that unlocked in-game and failed to unlock in Galaxy.

I unlocked my most recent achievement on 30 September - the same day updates 1.0.1 and 1.0.1b dropped. So I think it might be possible that those updates broke achievements, either in general or just for my current playthrough (since I started that playthrough on 1.0.0, maybe something got mixed up).

I don't really care for achievements, but I really hope unlocking in-game achievements doesn't have some sort of impact on the game, like unlocking a "true ending" or something like that. That would be pretty unfortunate...

With the latest update that the dev just uploaded to Galaxy (offline installers should be created in a few days) achievements have been fixed. It is also the newest version 1.03.

Thanks for keeping us updated. And thanks for the heads-up regarding the ending. I already finished the game over the weekend, but it's always helpful to know whether a game has some kind of "secret ending" you only get when you do X, Y and Z.

Since you finished already. There is this one side quest (the drunk guy) - the ending might change a little bit if you could help him or not but probably nothing more than a sidenote.

Yeah, I helped him and got a happy end slide for him as part of the overall ending. So there are some things in the game which change the slides you get at the end.