Why does the eastern European version of the game have a separate achievement list apart from the eastern European/American one? It makes no sense. The only way I would know is because I have my achievements linked to GIant Bomb, and the site shows two lists for Steam. I can understand that the language options are different, but why make a huge fuss about achievements? Just curious.

Are there different achievements for the different versions?

Nope. The lists are exact.