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

Kill someone with the shrapnel from a frag grenade.

Complete the game on the 'Easy' difficulty.

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

Kill everyone throughout the campaign.

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

Unlock all unique weapons.

Kill the Baker.

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

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

Complete a level whilst using naught but the Taser.

Complete a level unarmed.

Have your frag grenade shrapnel kill you.

Complete a level without being detected.

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

Complete a level without killing anyone.

Kill 6 enemies with guns in under 5 seconds.

Complete the game with ammo auto-grab disabled.

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

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

Pass out from drinking too much.

Finish 'Abandoned Complex' without killing anyone.

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

Kill the Degenerate.

Knock an enemy out with a door bash.

Complete a level without taking any damage.

Knock a startled enemy out

Have a flashbanged enemy accidentally kill his own friend.

Choke an enemy out.

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

Finish the campaign without using any weapons.

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

Over-cook a frag grenade.

Spare the Baker.

Get killed by a door bash.

Kill yourself with your own frag grenade.

Complete a level whilst using naught but the Tranquilizer Rifle.

Kill 5 enemies with a shotgun in 10 seconds.

Over-cook a flash grenade.

Finish the campaign with the Baker spared.

Finish the campaign with the Baker killed.

Kill 3 enemies with guns under 5 seconds.

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

Complete a level without saving once.

Complete the game on the 'True' difficulty.