Xbox Live Gamerscore:
Levels Cleared - Normal (100):
Acquired when you finish all levels in Normal difficulty.
ZE Launcher:
Complete all missions on the Normal difficulty level to get the ZE Launcher.
Y20 Impulse:
Complete all missions on the Hard difficulty level to get Y20 Impulse.
Levels Cleared - Inferno (300):
Acquired when you finish all stages in Inferno difficulty.
Levels Cleared - Hardest (200):
Acquired when you finish all levels in Hardest difficulty.
Levels Cleared - Hard (150):
Acquired when you finish all levels in Hard difficulty level.
All Levels Cleared - Easy (50):
Acquired when you finish all levels in Easy difficulty.
PX50 Bound Shot:
Complete all missions on the Hardest difficulty level to get the PX50 Bound Shot.
Genocide Gun:
Complete all missions on the Inferno difficulty level to get the Genocide Gun.
Get All Weapons (200):
Acquired when you get all the weapons in the game.
Zero Laser Rifle:
Complete all missions on the Easy difficulty level to get the Zero Laser Rifle.
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