Got another buggy achievement though - I got "Bounty Hunter" in Chapter 8, the one that you are supposed to get when you exterminate all the quest monsters. I got it despite still having a few remaining monsters to kill.
Now, on the subject of buggy achievements, two new ones... Master Chef I haven't received, even though I have all the recipes. I also didn't receive Blue Knight, despite having read all the books in the Calvard embassy (unless I'm missing something again?)
Anyone know if the achievements activate instantly like in Steam, or do you have to do something like save a game first?
I got the Bounty Hunter (monster extermination) a bit early too.
Some of the other achievements seem to be broken, and based on the steam reports, which achievements are broken seem to depend on which version of the game you're running.
I couldn't get Blue Knight from the initial version from release date, but I did manage to get it after the 11.26.2015 batch, but I can't get Breakfast Safari, even though I found them all in a single playthrough as well.
I'm also missing a few others, but since GOG Galaxy doesn't have counters, right now (still going through NG+ 100% playthrough), I can't tell if I'm missing something or whether it's simply not registering.
They are supposed to register right away.