G.I. Joe: The Rise of Cobra

This is a story related Achievement you get when finishing the game at the end of the 2nd Tundra Mission.

There will be a total of 4 Generators to destroy with a wave of enemies before each generator. Most of the enemies are just B.A.T.S's (The Battle Android Troopers) The last wave of enemies is the toughest though, obviously consisting of a few Cobra Drones. After defeating each wave of enemies just shoot everything you have into the generators above you. If you don't destroy the generator the first time, don't worry the damage stays on and it rotates back around again after the 4th wave.