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