Unlock Weapons and Items
50,000 Green Gel - Beat the game on any difficulty.
Brass Knuckles - Beat the game on Nightmare or AKUMU difficulty.
Burst Handgun - Collect all 28 map fragments.
High Penetration Sniper Rifle - Collect all 28 map fragments.
Machine Gun - Beat the game on any difficulty.
Model Viewer - Beat the game on any difficulty.
New Game Plus - Beat the game on any difficulty.
Nightmare and AKUMU difficulties - Beat the game on any difficulty.
Rocket Launcher - Beat the game on any difficulty.