In one session beat the game using only the knife in under 1 hour and 25 minutes [Hard Mode, Unequip any weapon at the beginning of the game and never equip it again, unequip it as soon as you get control of Carlos]
Defeat Nemesis at Treatment Room using only the knife with the clock above 3:00 Minutes [Equip the knife before the battle start, Hard Mode, Infinite Ammo is not allowed]
After killing nemesis at treatment room passthrough the control rom and get to the corridor in under 10 seconds without get hit and without killing a zombie [Hard Mode, Infinite Ammo is not allowed]
beat the game using only handgun in under 1 hour and 30 minutes [No Weapons Switch, No Enhanced Ammo, Unequip the Assault Rifle as soon you get control of Carlos, Hard Mode, Infinite ammo is not allowed]