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.