Damnation
29 Achievements
12-15h
PS3
Trooper
Complete the Game on Casual.
10.2%
How to unlock the Trooper achievement in Damnation - Definitive Guide
You will unlock this upon completion of Campaign Mode. Since the difficulty trophies stack stacks you will also unlock this if you complete the game on a higher difficulty whether in Co-op or Solo mode. See Peacemaker for general gameplay tips, you can expect pretty much the same on this difficulty but with less resistance.
See Revenant