Gamerscore Points:
Untouchable - 10:
Finish a zone without dying.
Sharp Shooter - 10:
Do not deplete more than 30% of your ammo.
Lair Slayer - 10:
Finish all underground zones.
Exterminator - 10:
Slay the giant spider.
Annihilator - 10:
Slay more than 85% of the total foes in a zone.
Twin Medal - 20:
Finish a zone in Co-op mode.
Tricked Out - 20:
Maximize all of the vehicle power-ups.
Survivor - 20:
Finish a zone killing 60% of the units while walking.
Speed Freak - 20:
Finish a zone in less than 15 minutes.
Small Arms Expert - 20:
Finish a zone without using nukes or grenades.
Peace Maker - 20:
Finish a zone killing less than 50% of the foes.
Assault Hero - 30:
Finish the entire game.
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