| Full Beard Moustache | In the back of the store "Waves of Style" in Royal Flush Plaza. |
| Knight Armor | Complete the game with the "S" ending. |
| Knight Boots | Buy at the Pawnshop in the Platinum Strip. |
| Knight Helmet Eliminate Jack in Strip Poker in the Ante Up side mission | Eliminate Jack in Strip Poker in the Ante Up side mission. |
Other Unlockable Clothing
| Champion's Jacket | Win a TIR episode (be the overall top player by the end) |
| Convicts | Kill 10 psychopaths |
| Dealer Uniform | Try on all clothing in the game. (excludes locker items) |
| Hockey Mask | Use every melee weapon on zombies |
| Tattered Clothes | Kill 1,000 zombies using hand to hand |
| TIR Helmet | Earn $1,000,000 in TIR Online |
| TIR Outfit | Earn $5,000,000 in TIR Online |
| Waitress Oufit, Bowling Shirt, Hunting Jacket, and Overalls | Start a game by importing a Case Zero file |
| Willemette Mall Costume | Rescue 50 survivors |
| Ending A | Do all cases and give Katey Zombrex every time but do not give TK Zombrex before completing The Facts. |
| Ending B | Give Katey Zombrex every time, starting from case 6-2, let the time pass by until it is 7AM on September 29; do not complete The Facts. |
| Ending C | Give Katey Zombrex every time, do not complete case 6-1 or fail any other case before 6-1, be in the safehouse before the military arrives. |
| Ending D | Be outside the safehouse by the time the military arrives. |
| Ending F | Do not give Katey Zombrex and be in the safehouse by the time the military arrives. |
| Ending S | Do all cases and give Katey Zombrex every time, give TK Zombrex before completing The Facts. |
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John Doe