Achievements
Complete each achievement to receive the allotted gamerscore:
Droppin Bombs (5) - Call in the airstrike to defeat the Command Center.
Hummer (10) - Kill 15 enemies on the HMV turret.
Kaboom (5) - Destroy the gas station.
Color Me Impressed (10) - Complete a mission on Normal without dying, failing, restarting, or continuing campaign.
Long Range (10) - Kill 20 enemies with a sniper rifle.
Rocketman (10) - Kill 2 aliens with one Rocket.
Seen Your Video (5) - Watch an unlocked video.
Sergeant Major (50) - Complete the game on Hard Difficulty.
One Hundo (50) - Unlock all the unlockables.
Pool and Dive (5) - Survive the pool attack.
Private (15) - Complete the game on Easy Difficulty.
Staff Sergeant (25) - Complete the game on Normal Difficulty.
Unlock Game Mods
Hollywood Mode (Enemies have big heads) - Beat the Campaign on Easy.
Double-Physics (Doubles the force of explosions) - Beat the Campaign on Medium.
Tough Guys (Enhances the health of enemies) - Beat the Campaign on Hard.