Fallout 3 – Mothership Zeta

Achievements:
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Complete each achievement to get the allotted gamerscore. If you have an Xbox
360 gamertag, you can log in using this same gamertag and the achievements
will count the same as if you were playing the 360 version.

Achievement How to unlock
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Alien Archivist (20) – Collected all Alien Captive Recordings.
Among the Stars (20) – Completed Among the Stars
Not of This World (20) – Completed Not of This World
This Galaxy Ain’t Big Enough… (40) – Completed This Galaxy Ain’t Big Enough…