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Liosan: The achievements in The Witcher 2 were never actually implemented. Sorry for the horrible confusion this caused :( We removed them until their implementation is finished.

December 2020 and still waiting
It's April 2021, and there are still no achievements for The Witcher 2.

I can't stop laughing at the absurdity of this situation. They have made achievements for Steam a long time ago, but can't do the same for THEIR OWN launcher.

I can understand (but don't support it) when some third-party developers don't want to update their games on GOG or add achievements for GOG Galaxy, but the situation with The Witcher 2 is beyond my understanding.

This is one of those situations that perfectly illustrates how much "respect" GOG shows to its customers. They just don't want to do anything about it. They just don't care.