Intravenous achievements

3.75%
CBT
You must really enjoy pain. Finish the game on 'Masochist' difficulty.
3.75%
Smooth Operator
Finish 'Abandoned Complex' without killing anyone.
3.75%
Sleeping Pills
Complete a level whilst using naught but the Tranquilizer Rifle.
3.75%
Sniper
Obtain a 100% accuracy rating with 40 or more shots fired.
3.75%
Hippy
Complete the game without killing a single enemy, unless when forced to.
3.75%
True Grit
Complete the game on the 'True' difficulty.
3.75%
Gun Nut
Unlock all unique weapons.
3.75%
Professional Boxer
Finish the campaign without using any weapons.
3.75%
Hands-on Experience
Complete the game with ammo auto-grab disabled.
3.75%
Do Not Disturb
Complete the level "Steve's House" without firing a single shot.
3.75%
Games Journalist
Complete the game on the 'Easy' difficulty.
3.75%
Unrelenting Anger
Kill everyone throughout the campaign.