Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Always Hard (30 points)	Kill the final Ancestor with a relic active in Hardcore difficulty.
Eggstra Nemesis! (20 points)	Complete the Egg-Stra XP challenge and then activate a generator in the Nemesis DLC package.
Hat Trick (20 points)	Kill 3 aliens with a single shot from the NX-1 Disruptor in Regular or Hardcore difficulty.
Mass Exodus (30 points)	Complete the final Ancestor encounter in Regular or Hardcore difficulty.
Nemesis Completionist (30 points)	Complete every challenge and the final Ancestor encounter in Regular/Hardcore difficulty.
Postmaster (20 points)	Complete any outpost by activating all of the generators in Regular or Hardcore difficulty.
The Final Chapter (20 points)	Find all 7 story related intel files in Exodus.
Timing is Everything (30 points)	Kill the final 3 Ancestors within 10 seconds of killing the first Ancestor in Regular/Hardcore.
Unstoppable (30 points)	Complete the final Ancestor with at least 1 relic in Regular or Hardcore difficulty.
You Wish (20 points)	Hit an Ancestor with a Hypno Knife in Regular or Hardcore difficulty.