Here is the full list of all 9 Vixens From Outer Space achievements.
Kill the first wave of Migos in Story Mode using less than 80% of the magazine
Kill 50 Migos in different games
Kill 200 Migos in different games
Complete Act 1 of the story without dying
Horde: Survive for more than 15 waves on the "Born to Die" map
Find the blueprint for mp-69