Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Almost Dead	Passed level with minimal health.
Captain	1000 enemies defeated.
Corporal	50 enemies defeated.
Corpses Collector	Defeated enemy of every kind.
Experienced Shooter	Level 2 passed.
First Blood	Defeated the first enemy.
Hope of Humanity	Level 3 passed.
Lieutenant	500 enemies defeated.
Lord of the Bones	Killed 100 times.
Olivia's Favorite	Olivia likes you.
Out on Limb	Killed for the first time.
Promising Soldier	Level 1 passed.
Risen from the Dead	Killed 50 times.
Safe and Sound	Level passed without damage.
Savior	Passed all levels.
Sergeant	100 enemies defeated.
Specialist	10 enemies defeated.
Stealth Master	Passed level without first aid kits and armor.
Suicidal Savior	Killed 1000 times.
Turret Summoner	Collected all the turrets at the level.
Unlucky Hero	Killed 10 times.
Walking Dead	Killed 500 times.
Weapon Collector	Collected all weapons.