Here is the full list of all 12 Warhammer 40,000: Kill Team achievements.
Play through each mission with two different Space Marines
Find all the collectables
Get over 50 kills with each weapon type
Unlock all weapons and ability upgrades
Earn a gold Aquila in every survival challenge
Defeat the Warboss!
Kill 5000 enemies in total
Achieve a "Bloodbath" Kill streak
Complete a mission in co-op mode
Complete a mission without dying
Complete a mission without using melee
Use a special move