| 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. |
