Intravenous achievements

3.03%

Do Not Disturb

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

3.03%

Professional Boxer

Finish the campaign without using any weapons.

3.03%

Sleeping Pills

Complete a level whilst using naught but the Tranquilizer Rifle.

3.03%

Games Journalist

Complete the game on the 'Easy' difficulty.

3.03%

Sniper

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

3.03%

CBT

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

3.03%

Smooth Operator

Finish 'Abandoned Complex' without killing anyone.

3.03%

Hippy

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

4.04%

Gun Nut

Unlock all unique weapons.

4.04%

Creep

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

4.04%

Unrelenting Anger

Kill everyone throughout the campaign.

4.04%

Perfect Opportunity

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