Private

 

Complete the game on Easy Difficulty

Kaboom

 

Destroy the gas station

Pool and Dive

 

Survive the pool attack

Droppin Bombs

 

Call in the airstrike to defeat the Command Center

Seen Your Video

 

Watch an unlocked video

Staff Sergeant

 

Complete the game on Normal Difficulty

Long Range

 

Kill 20 enemies with a sniper rifle

Color Me Impressed

 

Complete a mission on Normal without dying, failing, restarting, or continuing campaign

Hummer

 

Kill 15 enemies on the HMV turret

Rocketman

 

Kill 2 aliens with one Rocket

Sergeant Major

 

Complete the game on Hard Difficulty

One Hundo

 

Unlock all the unlockables