Pass out from drinking too much.
Kill 3 (or more) enemies with a single frag grenade.
You must really enjoy pain. Finish the game on 'Masochist' difficulty.
Have a flashbanged enemy accidentally kill his own friend.
You really enjoy listening in on private matters, don't you?
Kill someone with the shrapnel from a frag grenade.
Complete the level "Steve's House" without firing a single shot.
Complete a level whilst using naught but the Taser.
Complete the game on the 'Easy' difficulty.
Complete a level without being detected.
Bait an enemy with your microphone, then take them out.
Unlock all unique weapons.
Complete the game with ammo auto-grab disabled.
Complete the game without killing a single enemy, unless when forced to.
Kill yourself with your own frag grenade.
Have your frag grenade shrapnel kill you.
Complete a level without saving once.
Knock an enemy out with a door bash.
Kill 3 enemies with guns under 5 seconds.
Bait an enemy by talking nonsense, then take them out.
Over-cook a frag grenade.
Neutralize someone while they are under the effect of a flashbang.
Complete a level without killing anyone.
Over-cook a flash grenade.
Kill 8 (or more) enemies with a single frag grenade.
Kill 5 (or more) enemies with a single frag grenade.
Finish the campaign without using any weapons.
Complete a level unarmed.
Kill 5 enemies with a shotgun in 10 seconds.
Knock a startled enemy out
Complete a level whilst using naught but the Tranquilizer Rifle.
Finish 'Abandoned Complex' without killing anyone.
Obtain a 100% accuracy rating with 40 or more shots fired.
Kill 6 enemies with guns in under 5 seconds.
Choke an enemy out.
Complete the game on the 'True' difficulty.
Kill everyone throughout the campaign.
Complete a level without taking any damage.
Take out an enemy that's investigating an enemy body.
Get killed by a door bash.
