Seasoned Squaddie - Complete any multiplayer level.
Bigger is Better - Purchase any weapon upgrade.
Version 2.0 - Purchase an item upgrade.
At Your Mercy - Kill a stunned alien with a Frag Grenade.
The Initiated - Complete the prologue on any difficulty level.
Bigger Isn't Always Better? - Kill a sentry gun with the Blaster.
Networking - Complete any co-op assault map over PlayStation Network.
Exploding Fist - Kill 3 burster aliens with one melee attack.
Into the Kill Zone - Kill 20 aliens with one sentry gun.
Recon Unit - Complete any single player level with the waypoints turned off.
K.I.A. - Locate the bodies of Vance and Barnes.
Hard Up? - Sell any item.
Sunny Side Up? - Kill an alien egg using the melee attack.
Shattered - Smash 10 windows.
Grave Robber - Collect 50 items or weapons from human corpses.
Lost? - Access the map screen.
Battle-hardened - Complete all single player levels 1-5.
Immobilised - Use a stun grenade to stun 10 aliens at the same time.
Frag-master - Use a Frag Grenade to kill 10 aliens at the same time.
The Informed - Collect all logs through out the game.
Survivor - Stay alive for 8 minutes or better on any of the Survivor mode single player levels.
Meat Grinder - Kill 250 aliens on any of the Survivor mode multi player levels.
Hidden Treasure - Find all 'secret' collectibles.
Tank - Take 200 damage without dying on 'Determination' single player mission.
Survivors - Achieve a time of 8 minutes or better on any multiplayer survivor map.
Light 'em up! - Kill 5 aliens with one shot of Project X.
Exterminator - Kill 1000 aliens in single player.
Idle Sentries - Finish any level with five Sentry guns in your inventory.
Systems Crash - Kill Mia.
Regicide - Destroy the alien queen.
Elite Unit - Complete all single player levels 1-5 on elite difficulty.
More Speed, Less Haste - Complete 'Vengeance' single player level on Veteran mode in 17 minutes or less.
Can't Get Enough - Complete the prologue, all single player, co-op assault and survivor maps.
Hardcore - Complete any single player level using only the Blaster and Grenades.
The Completionist - Earn all Bronze, Silver, and Gold trophies.