Complete all levels on HELL difficulty.
Kill 4000 enemies with Electric rifles.
Complete 8 battles on HELL difficulty.
Kill 4000 enemies with a sniper rifle.
Kill 4000 enemies with a grenade launcher.
Complete all levels on HARD difficulty.
Kill 2000 enemies with a grenade launcher.
Kill 2000 enemies with Electric rifles.
Complete the game as Medic.
Destroy 1200 crystals blocking the way.
Complete the game with Mechanic.
Set up any 3rd level turret during battle.
Complete the game.
Complete all levels in cooperative mode.
Complete the N'Aliens campaign.
Get three stars for all the levels in the main campaign.
Complete the game with Warrior.
Kill 4000 enemies with turrets.
Collect all samples of matter hidden in the levels.
Kill 2000 enemies with a sniper rifle.
Kill 20000 any enemies.
Kill 900 by setting them against the others.
Kill 4000 enemies with a shotgun.
Use any special ability 100 times.
Kill 2000 enemies with a shotgun.
Buy any special ability in the store.
Play the game for 30 minutes in battles.
Kill 10000 any enemies.
Kill 4000 enemies with auto rifle.
Complete 8 levels with 3 stars.
Kill 400 by setting them against the others.
Kill 2000 enemies with auto rifle.
Fully upgrade any turret.
Kill 5000 any enemies.
Buy 5 any weapons in the store.
kill 15 enemies in 1 seconds with any gun.
Don't use turrets while 10 battles.
Play the game for 15 minutes in cooperative mode.
Don't use medkits for 15 levels in a row.
Resurrect.
Fully upgrade any weapon.
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