Complete the following achievements to unlock Xbox Live Gamerscore points.
Achievement | How to unlock
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- Against the Odds ( 25 points )
| - Complete single player levels 1-5 on Elite difficulty.
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- Ain't got time to bleed! ( 20 points )
| - Complete 'Interface' single player mission without using a health pack.
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- Born to Kill ( 10 points )
| - Kill a total of 25 aliens in single player.
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- Break Out the Arsenal ( 10 points )
| - Fire every weapon and use every item in single player.
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- Campaign Veteran ( 25 points )
| - Complete all single player levels 1-5.
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- Elite Force ( 10 points )
| - Kill 50 aliens in a row without taking damage in single player.
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- Fighting Light ( 20 points )
| - Complete any single player level without using any items.
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- Hard to Kill ( 20 points )
| - Complete CO-OP Assault level 1, 2 or 3 without either player dying.
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- Killing Spree ( 10 points )
| - Kill 20 aliens within 30 seconds in single player.
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- Knowledge is Power ( 20 points )
| - Collect all the logs throughout the game.
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- No Stone Unturned ( 10 points )
| - Find all secret collectibles.
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- Team Veteran ( 20 points )
| - Complete "Hydroponics" in Co-op Assault.
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