As I know, the achievements are available since the release of the game, and some of them are very hard (or long) to be earned. And many achievements have multiple levels, which is quite unique in my opinion. For example there is an achievement for playing the game for 1000 hours. That is the third level of the Player Time achievement. I played this game for 626 hours so far, so I need to play it for an additional 374 hours to earn that achievement.

Good luck and have fun.

!PIZZA.
!LUV.