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Some achievements in GOG version of OFDP2 are broken:

* "The wise amster wander the lands" - I've completed all levels on all maps and I didn't get this achievement, it seems it was always broken since according to GOG statistics no one ever unlocked this achievement
* "Enter the background music test" - didn't unlock for me even after I entered background music test few times
* "Beat the last level in the Gauntlet Normal" - didn't unlock for me when I finished the Gauntlet mode and unlocked blind version of it
I was able to get the "Enter the background music test" achievement: I opened the screen and played the music. I also see some players got the "Beat the last level in the Gauntlet Normal" (I was not able to beat the last level so far).

So from my point of view, the "The wise master wanders the lands" achievement is the only one which is broken in the GOG version.