Iron Man 2
51 Achievements
12-15h
PS3
Two Man Army
Defeat the Russian separatists as both Iron Man and War Machine.
10.1%
How to unlock the Two Man Army achievement in Iron Man 2 - Definitive Guide
Complete level 2, Russia and Roxxon as both Iron man and War Machine easy enough mission, useful for grinding kills towards "Kill X amount of enemies with..weapon" achievements
Load the level back up after completing it for the first time but this time pick War Machine. (You select him in the Headquarters). As soon as you beat the level with War Machine the trophy will pop up.