Here is the full list of all 26 Alien Removal Division achievements.
Remove 5 aliens while sliding
Remove 100 aliens
Load all 8 bullets for the Shotgun's Alternate Fire
Don't touch the ground for at least 10 seconds
Remove 50 aliens
Run out of fuel
Break 5 alien eggs
Remove 10 aliens while in air
Destroy 1 explosive dummy
Remove 5 aliens while wallrunning
Remove 3 aliens with one grenade explosion
Grapple 3 times in a row
Get a time of 34 seconds or less in The Bonewald trial
Place first in The Bonewald leaderboard
Finish the game in under 8 minutes
Complete the game without dying
Destroy all 7 explosive dummies
Be very indecisive when you leave The Bonewald