Exterminator - Defeat the giant spider.
Unstoppable - Finish a zone without losing a life.
Annihilator - Kill more than 85% of the total enemies in a zone.
Small Arms Expert - Finish a zone without using grenades or nukes.
Twin Medal - Finish a zone in Co-op mode.
Speed Freak - Finish a zone in less than 15 minutes.
Tricked Out - Max out all of the vehicle power-ups.
Sharp Shooter - Maintain an accuracy higher than 70%.
Lair Slayer - Complete all underground zones without using a continue.
Peace Maker - Finish a zone killing less than 50% of the enemies.
Survivor - Finish a zone killing 60% of the units on foot.
Assault Hero - Beat the game.