Hi there. My problem is that I started to play the witcher 3 on the normal edition. When I bought the other DLCs on GOG, it had automatically offered me the GOTY edition so I continued to play there. After I finished the game I realized that the achievements what I had on the normal edition didn`t came trough to the GOTY edition. So now I have two editions of the game in my GOG library with half and half of the achievements. Is it possible to copy them together or something like that? Thank you

Nope, I was in same situation as you, you can only swap save files between those 2 versions...

Such a shame. Thanks for your quick answer anyway.