Achievements

Achievements can be earned by performing various tasks. Achievements can also be locked to be earned again. As explained here: https://www.youtube.com/watch?v=Z-CcrppjScE

Steam and GOG
There are a total of 88 achievements.

Xbox 360
There are a total of 30 achievements, worth 400 points.

Playstation 3
There are a total of 39 trophies: 1 Platinum, 2 Gold, 19 Silver and 17 Bronze.

iOS
There are a total of 12 achievements, for a total of 660 points