Complete the following achievements to unlock Xbox Live Gamerscore points.
Achievement | How to unlock
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| - Collect all Alien Artifacts.
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- Close Encounter (10 points)
| - Kill 10 alien Necromorphs.
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- Critical Mass (15 points)
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- Drill Sergeant (30 points)
| - Complete the Drill Room without taking any damage.
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| - Reach the pump room of the Waystation without alerting any Feeders.
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- Infernal Machine (15 points)
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- Intestinal Fortitude (25 points)
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- Shoot for the Moon (50 points)
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| - Shoot at least 70 targets during the ride to Tau Volantis.
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- Space Odyssey (15 points)
| - Survive your first spacewalk.
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- Stranger in a Strange Land (10 points)
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- Together as One (15 points)
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| - Shoot the deer head trophy in the Admiral's Quarters.
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| - Kill 5 Cysts in the Biology Building with a single poison gas cloud.
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