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So

today I started GOG client for the first time in almost 6 months.
it hung on MIGRATING DATA

so I installed the client from the site

when I got back into GOG GALAXY

ALL of my ACHIEVEMENTS for witcher 3 are now reset to 0% and none gotten.

how did this happen and can I get them back?!?!
This question / problem has been solved by mike_cesaraimage
restart Galaxy.. should work fine
Something similar happened with me on steam.
It took me half a day to unlock all achievements of Risk of Rain.
love that solution

gog be like 8)
..have you tried turning it off and on again? ; )
This person would have loved this issue