Free Play mode:
Complete the game to play any Story mode live in Free Play mode.
Co-op Campaigner - Complete any multiplayer level.
Deadly Combo - Kill a stunned alien with a Frag Grenade.
Doctor in the House - Heal yourself for 200 hit points using health kits.
Goodbye Cruel World - Blow yourself up with a Frag Grenade.
Hardcore Pawn - Sell any 10 items or ammunition at an Intex Vendor.
Hoovering Up - In a multiplayer game, acquire 80% of all items, ammo, weapons, and cash in one level.
Medic! - Purchase the Health Kit Upgrade.
Pathfinder - Complete a single player level with Waypoiny Display turned off.
Protectionist - In single player story mode, purchase 5 Hardened Armor items from the Intex Vendor.
Rocketman - Kill a sentry gun with one rocket.
Safety First? - Save the game 5 times in single player story mode
Smackdown - In single player story mode, melee one of each type of alien.
Old Soldier - Complete all single player levels 1-5.
War of Attrition - Kill 1000 aliens in single player.
Vital Statistics - Finish 'Primed' single player level with 300000 or more overall score.
Praemonitus Praemunitus - Collect all logs throughout the game.
Survivor - Stay alive for 8 minutes on any of the Survivor mode single player levels.
Rapid Deployment - Complete 'Cargo' multiplayer level in 10 minutes or less.
Super-Sleuth - Finall 'secret' collectibles.
Deadly Assassin - Without taking damage kill 50 aliens in single player.
Material World - Buy every upgrade.
Lazy - In a multiplayer game, reach the end of a level without dying or firing a shot.
Sentry Duty - In single player, use a sentry gun to kill 20 aliens.
Octo-who? - Defeat Octo-Morph.
Incy Wincy - Defeat Arachno-Morph.
The Best of the Best - Complete all single player levels 1-5 on elite difficulty.
Indestructible - Finish multiplayer 'Cargo' level without taking any damage.
Tormentor - Deal 200 damage to one alien.
Speed Freak - Complete Story Mode on elite difficulty with a total time played of 4 hours or less.
Ultimate Boom stick - Purchase the Damage upgrade for the Rocket Launcher.
The Completionist - Earn all Bronze, Silver, and Gold trophies.