Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Advanced Weaponry	Take each mod on a mission.
All or nothing	Have characters use 3 limited use items in a turn.
Bloodless	Complete a mission without taking any damage.
Boom! Headshot!	Kill an enemy due to the bonus critical hit damage.
Boot Camp	Completed the whole Tutorial mission (with Tutorial active)
Click, Boom!	Hit 3 enemies in a single explosion.
Completionist	Do all missions in a single campaign.
Cored	Kill a Shoggoth section entirely surrounded by other Shoggoth sections.
Empty the Mag	Take a gun from full mag to empty in a single turn.
Excessive Ordinance	Throw 20 grenades.
Going Commando	Have 1 character use 6 Momentum in a single turn.
Hospital	Use 10 medkits.
Inventory Management	Take each item on a mission.
Last Stand	Have 3 characters Incapacitated and pick one up with Stay With Me.
Mass Panic!	All allies suffered from a Psychological Effect this turn.
MultiKill	1 player Character kills 3 more enemies in a single turn.
Objection	Complete all main and side objectives in main missions.
Overkill	Kill an enemy dealing 10 points more than their current HP.
Participation Award	Complete a mission with at least 1 character not dealing any damage.
Piles Of Bodies	Kill 200 enemies overall.
Scraping Through	Complete a mission with all characters having been rendered Incapacitated at least once.
Shot in the Dark	Kill an unrevealed enemy.
Sidelines	Complete a side mission.
Staggering	All allies are staggered at the same time.
Tanks For The Memories	Complete the campaign.
Thin The Ranks	Kill 100 enemies overall.
Tough Cookie	A character is hit by 5 attacks in the same turn without being rendered unconscious.
Untouchable	A character is missed by 5 attacks in the same turn.
War Hero	Collected all other achievements.
Why Won't You Die!?	Have 3 characters damage a single target without killing it.