So just finished the game and none of achievments for unlocking character speciaization proced. I played it through Galaxy with Galaxy achievs turned off but highly doubt that matters.

So is that a general bug or only bugged for GOG version?

Edit: Okay, seems in Single Player it doesnt unlock anything but just now tried some MP and suddenly achievments started to pop up but still no unlock though.

Achievements don't unlock if you're using Galaxy while being offline, this is probably connected to that. We're working on a fix, and hopefully we'll be able to get the patch out soon.

Sorry for the inconvenience!

- Maarit from Frozenbyte