Cheat Mode

Start game as usual, then create a new profile named "V PIRATE" (without the quotes but with a space and all letters in CAPITALS) and you will have access to all missions, challenge modes, punishment modes, armory, war journal stuff, comic covers, concept art, flashbacks, movies, skins and cheats.

Unlock Skins

From the Main Menu, go to Extras > Cheats > Unlock Skin then type any of the following codes:

Code: Result:
CEILINGFAN 2000 Skin
WOODCHIPPER 1990 Skin
NAILGUN 1980 Skin