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