Assault Hero
Complete the game.
30 
Small Arms Expert
Finish a zone without using grenades or nukes.
20 
Twin Medal
Finish a zone in Co-op mode.
20 
Speed Freak
Finish a zone in less than 15 minutes.
20 
Peace Maker
Finish a zone killing less than 50% of the enemies.
20 
Tricked Out
Max out all of the vehicle power-ups.
20 
Survivor
Finish a zone killing 60% of the units on foot.
20 
Exterminator
Defeat the giant spider.
10 
Sharp Shooter
Don't waste more than 30% of your bullets.
10 
Unstoppable
Finish a zone without losing a life.
10 
Lair Slayer
Complete all underground zones.
10 
Annihilator
Kill more than 85% of the total enemies in a zone.
10