To unlock all Art, enter "ShovelFighter"(case-sensitive) as your profile name.

To unlock first person shooter mode in which you receive unlimited ammo, complete the game.

Unlockable Items:
Complete the following missions to unlock the corresponding items:

MISSION - ITEMS
Mission 1 - Silver brass knuckles & gold fist blade
Mission 2 - Silver bullet proof vest & gold flak jacket
Mission 3 - Gold taser 5 shots
Mission 4 - Holster
Mission 5 - Rubber soles

Entitlement Rewards:
Unlock the following entitlement rewards by performing the corresponding tasks:

REWARD - HOW TO UNLOCK
Anger Management - Complete 10 emotional responses.
Beat Cop - Complete a mission.
Big-game Hunter - Take out 10 enemies with the antler.
Brick Wall - Complete 5 successful blocks.
Chain Gang - Successfully execute each attack chain 5 times.
Cut throat - Perform 25 finishing moves.
Decisive Restraint - Don't kill a single museum guard.
Detective/First grade - Complete all missions in FPS mode
Gold-plated - Get the gold badge for every mission on any difficulty
Punch-drunk Kill 10 players with your fist.
Serial killer - Kill 1000 players.
Sidekick - Assist in scanning evidence in crime scene mode.
SKX - Kill 9 unique players with the serial killer reward.
Sleuth - Get a perfect score in a forensic event.
The Plumber - Take out 50 enemies with the pipe.
Trooper - Complete all missions on any difficulty.
Tune in Tokyo - Collect all TV'S in each mission.