Infinite Ammo:
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Complete Story Mode on the Hard difficulty setting to unlock infinite
ammunition in all game modes.

Big Tony:
———
Beat the Mafia Mission on normal to unlock the master. . .
Big Tony

Unlock arcade level called Streets:
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To unock the arcade level ”Streets”, just beat the game on easy difficulty.

Unlock Cardboard Characters:
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Beat the game on easy to obtain the Cardboard Characters cheat.

Unlock Characters In Arcade Mode:
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Earn a Gold medal in Adios Amigos (Arcade) to unlock Hector Babasco
and Lean Molly.

Unlock Rotating Heads Cheat:
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To unlock the rotating heads cheat, just beat Pane in the Neck in
Silver (Challenge mode).

Unlock Some Silly Hats:
———————–
Viking Hat – Beat ”Silent But Deadly” with a Gold or Silver medal

Pirate Hat – Beat ”Trouble At The Docks” with a Gold or Silver medal.

Big Ears – Beat ”Escape from Neotokyo” with a Gold or Silver medal.

Unlock the Site Multiplayer Level:
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I noticed the level unlock code someone submitted didn’t list The Site.
To unlock The Site level, complete Story mode on Hard.

View the Ending Movie:
———————-
Successfully complete the Space Station on Easy mode to view the ending movie.