Objective: Defeat the giant spider.
Objective: Finish a zone without losing a life.
Objective: Kill more than 85% of the total enemies in a zone.
Small Arms Expert
Objective: Finish a zone without using grenades or nukes.
Objective: Finish a zone in Co-op mode.
Objective: Finish a zone in less than 15 minutes.
Objective: Max out all of the vehicle power-ups.
Objective: Keep your accuracy higher than 70%.
Objective: Complete all underground zones without using a continue.
Objective: Finish a zone killing less than 50% of the enemies.
Objective: Finish a zone killing 60% of the units on foot.
Objective: Complete the game.