The Punisher

The Punisher cheat codes: 
Get a gold medal rank on the indicated level to unlock the
corresponding cheat in an apartment sub-menu. You cannot
progress in the game if any cheats are enabled.

Crazy Deaths   - Lucky's Bar level
Gun Splitters  - Crack House
One Shot Kills - Ryker's Island
Unlimited Ammo - Pier 74 Revisited

Skins:
Select the "Extras" option at the main menu.
Select the "Cheats" option, then "Unlock Skin".
Type one of the following codes to activate
the corresponding cheat function:

CEILINGFAN  - 2000 skin
WOODCHIPPER - 1990 skin
NAILGUN     - 1980 skin