Here is the full list of all 12 Warhammer 40,000: Kill Team achievements worth 200 gamerscore.
Earn a gold Aquila in every survival challenge
Play through each mission with two different Space Marines
Find all the collectables
Get over 50 kills with each weapon type
Defeat the Warboss!
Unlock all weapons & ability upgrades
Achieve a "Bloodbath" Kill streak
Kill 5000 enemies in total
Complete a mission without dying
Complete a mission in co-op mode
Complete a mission without using melee
Use a special move