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