Just lost all the achievements

Reached about lv100 on hardcore mode and just lost almost all the achievements (about 140). Feel very disappointed. Is there any chance that it can be fixed and got’em back?

I can only partly back that up.
Some patches ago, from time to time, all my (age old) achievements would pop up one by one, cluttering the screen with text. As if there was some kind of reboot to my achievements.
Using Gog.

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