Intravenous Steam Key

Whodunit?

Take out an enemy that's investigating an enemy body.

Master Baiter

Bait an enemy by talking nonsense, then take them out.

Good Vocals

Bait an enemy with your microphone, then take them out.

Sweet Dreams

Choke an enemy out.

Rude to Interrupt

Knock a startled enemy out

Knock-knock...

Knock an enemy out with a door bash.

Death Metal

Kill someone with the shrapnel from a frag grenade.

Lucky Shot

Kill 3 enemies with guns under 5 seconds.

Somebody Stop Me!

Kill 6 enemies with guns in under 5 seconds.

Room Clearing Service

Kill 5 enemies with a shotgun in 10 seconds.

Beginner Tactician

Kill 3 (or more) enemies with a single frag grenade.

Precious Explosives

Kill 5 (or more) enemies with a single frag grenade.

Perfect Opportunity

Kill 8 (or more) enemies with a single frag grenade.

Collateral Damage

Have a flashbanged enemy accidentally kill his own friend.

Out of Their Misery

Neutralize someone while they are under the effect of a flashbang.

How Do I Shot Web?

Kill yourself with your own frag grenade.

Illusion of Safety

Have your frag grenade shrapnel kill you.

Melted Ice-cream

Over-cook a frag grenade.

Paparazzi

Over-cook a flash grenade.

...who's there?

Get killed by a door bash.

Ghost

Complete a level without being detected.

Pacifist

Complete a level without killing anyone.

Electro

Complete a level whilst using naught but the Taser.

Pugilist

Complete a level unarmed.

Sleeping Pills

Complete a level whilst using naught but the Tranquilizer Rifle.

Smooth Operator

Finish 'Abandoned Complex' without killing anyone.

Unscathed

Complete a level without taking any damage.

Iron Man

Complete a level without saving once.

Best Served Cold

The Enemy of my Enemy...

Cause and Effect

...is my Friend

On My Own

Professional Boxer

Finish the campaign without using any weapons.

Hippy

Complete the game without killing a single enemy, unless when forced to.

Unrelenting Anger

Kill everyone throughout the campaign.

Games Journalist

Complete the game on the 'Easy' difficulty.

True Grit

Complete the game on the 'True' difficulty.

Hands-on Experience

Complete the game with ammo auto-grab disabled.

Do Not Disturb

Complete the level "Steve's House" without firing a single shot.

Gun Nut

Unlock all unique weapons.

CBT

You must really enjoy pain. Finish the game on 'Masochist' difficulty.

Alcoholics United

Pass out from drinking too much.

Creep

You really enjoy listening in on private matters, don't you?

Sniper

Obtain a 100% accuracy rating with 40 or more shots fired.