Timing is Everything
Kill the final 3 Ancestors within 10 seconds of killing the first Ancestor in Regular or Hardcore difficulty.
9/24/2014
9:23:01 AM
Ultra Rare 0.1%
Eggstra Nemesis!
Complete the Egg-Stra XP challenge and then activate a generator in the Nemesis DLC package.
9/20/2014
9:01:43 AM
Ultra Rare 0.2%
Always Hard
Kill the final Ancestor with a relic active in Hardcore difficulty.
9/13/2014
12:16:19 AM
Ultra Rare 0.1%
You Wish
Hit an Ancestor with a Hypno Knife in Regular or Hardcore difficulty.
9/5/2014
7:42:46 PM
Ultra Rare 0.2%
Nemesis Completionist
Complete every challenge and the final Ancestor encounter in Regular or Hardcore difficulty.
9/5/2014
10:41:44 AM
Ultra Rare 0.3%
Unstoppable
Complete the final Ancestor with at least 1 relic in Regular or Hardcore difficulty.
9/5/2014
8:48:57 AM
Ultra Rare 0.3%
Mass Exodus
Complete the final Ancestor encounter in Regular or Hardcore difficulty.
9/4/2014
11:32:53 PM
Ultra Rare 0.6%
Hat Trick
Kill 3 aliens with a single shot from the NX-1 Disruptor in Regular or Hardcore difficulty.
9/4/2014
4:57:44 PM
Ultra Rare 0.5%
Postmaster
Complete any outpost by activating all of the generators in Regular or Hardcore difficulty.
9/4/2014
3:39:20 PM
Ultra Rare 0.8%
The Ghost Killer
Confront Rorke (Complete "The Ghost Killer" on any difficulty.)
8/15/2014
3:02:03 AM
Rare 27.4%
LOKI
Commandeer the enemy space station. (Complete "Loki" on any difficulty.)
8/15/2014
2:44:44 AM
Rare 29.4%
Severed Ties
Destroy the Federation's satellite array (Complete "Severed Ties" on any difficulty.)
8/15/2014
2:34:29 AM
Rare 29.9%