2nd Amendment mode: Successfully complete the first four missions in Quest mode.
Bikini costume: Successfully complete the game with an "A" rank on the Normal difficulty.
Bionic Commando costume: Successfully complete the game twice.
Chicago Typewriter: Successfully complete the game with an "A" rank on the Normal difficulty.
Laser Sword: Successfully complete all missions in Odd Jobs mode with an "S" rank.
Mall employee uniform: Successfully complete the "Out Of Control" mission with an "S" rank.
Megaman Boots: Successfully complete all missions in 2nd Amendment mode.
Megaman Tights: Successfully complete all missions in 2nd Amendment mode with an "A" rank.
New Game+ mode: Successfully complete the game. This mode allows you to start a new game with your previously earned inventory items and level.
Odd Jobs mode: Successfully complete the game.
Police Cap: Successfully complete the game with an "A" rank on the Normal difficulty.
Prisoner Garb costume: Successfully complete the "Prisoners" mission with an "S" rank.
Pro Wrestling Boots: Successfully complete the game with an "A" rank on the Normal difficulty.
Quest mode: Successfully complete the game with an "A" rank on the Normal difficulty.
Real Mega Buster: Successfully complete all missions in 2nd Amendment mode with an "S" rank.
Red 9: Successfully complete the "Lovers" mission with an "S" rank.
Riot Gun: Successfully complete the "Dressed For Action" mission with an "S" rank.
Roll costume: Successfully complete the game with an "S" rank on the Hard difficulty.
Semi-Automatic Rifle: Successfully complete the "Mark Of The Sniper" mission with an "S" rank.
Special Forces costume: Successfully complete the game with an "A" rank on the Hard difficulty.
Wrestling Briefs: Successfully complete all missions in Odd Jobs mode with an "A" or better rank.
Yakuza costume: Successfully complete the game with an "A" rank on the Normal difficulty.

Secret Case File
Get an "S" rank on all files. Near the end of Case 5, you will unlock a secret case file to take down the sniper family.

Extra kills
Once you have a sniper rifle, go to the rooftop of the mall where the elevator is located. Take a look at the parking lot through the fence at the right of the elevator door. You can see many zombies walking through the parking lot that can be shot to raise your killing score.

During the final case, when the Special Forces arrives and kills all zombies in the mall, you will see a lot of zombie corpses on the ground inside the mall, killed by the Special Forces. You can shoot them, and it counts as a kill even through they are already dead.

Free Killer 7
When Cletus has the Killer 7 on the table, look at it, but do not pick it up when prompted. Cletus will give it to you free later.

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