Complete the indicated task to unlock the achievement.

Achievement	How to unlock
4th of July	Unknown.
Addicted	Reach 50% of overdose.
Back in time	Unknown.
Blown away	Unknown.
Bookworm	Get all documents.
Boxer	Knockback 20 enemies using melee attacks.
Bullseye	Take out 50 enemies with headshots.
Butcher	Cast off 50 enemy limbs.
Chapter 1	Complete chapter one.
Chapter 2	Complete chapter two.
Chapter 3	Complete chapter three.
Chapter 4	Complete chapter four.
Chapter 5	Complete chapter five.
Chemist	Craft every type of rapid use fluid.
Codename Broken Arrow	Unknown.
Daymare syndrome	Shoot at 5 false enemies.
Déjà vu	Unknown.
Disc jockey	Get all audiologs.
File still open	Unknown.
Free hugs	Free yourself from 20 grabs.
Games of war	Unknown.
Green thumb	Unknown.
Gunslinger	Unknown.
Hand cannon	Unknown.
Hijacker	Hack into a "very hard" terminal.
Hound	Find all Hexacore secret rooms.
Hunting season	Spot all puppet deer.
Immortal	Finish the game without dying.
Invader Studios hires	Unknown.
Jurassic theft	Unknown.
Maverick	Unknown.
Primitive experiments	Unknown.
Problem solving	Unknown.
Quick hands	Utilize 100 fast reloads.
Rat sterminator	Unknown.
Runner	Finish the game in 4 hours or less.
Slaughter	Unknown.
Stabbed	Unknown.
Surgeon	Get all ID Tags.
Take your time	Utilize 100 slow reloads.
Trader	Perform 10 exchanges at an H.I.V.E. terminal.
What is IT?	Unknown.
Where's the fog?	Unknown.
Wrong melee	Perform a melee attack on the Melted Man.
Wrong turn	Unknown.