ussnorway: achievements work just fine on my Galaxy system perhaps my 356 games are different to yours and no i don't own Sid Meier's Pirates but its not a Gog game so expect you are correct about it not working
I'm referring to titles that the developers *have* made scripts that track achievements available for the titles, but GOG hasn't asked for them to be available for consumers that choose to buy here. Another example would be with all of Beamdog's "enhanced edition" remakes sold here. Like for your Baldur's Gate Enhanced Edition, the developers have made the scripts available, but they're not offered to GOG consumers that use the Galaxy client. You *should* have access to achievements for those titles, but GOG hasn't asked for them here. I'm wondering if talented modders would be able to help add missing achievements like these to the Galaxy client...when the developers have already created them.
I'm also unsure what you meant by Sid Meier's Pirates! not being a GOG game. Were you meaning that it wasn't developed by CD Projekt Red? That would certainly narrow the list of titles down, I'm sure. It is sold here, however:
https://www.gog.com/en/game/sid_meiers_pirates . I'm unsure why GOG didn't ask for the achievements to be made available to consumers that use the Galaxy client. Do you have any insight here?