On the Unlockables menu hold the nunchuck up and and an input code window will pop up
"Lots Of Guns": Right Left Down Left Up
Can't Be Killed: LDURU
Crypto Dance Fever Skin: Right Left Right Left Up
Infinite Ammo: Right Up Up Left Right
Infinite Jetpack: Right Right Up Left Left
Kluckin's Chicken Blimp Skin: LUDUD
Leisure Suit Skin: Left, Down, Right, Left, Right
Pick up Heavy Objects: Down, Up, Left, Up, Right
Pimp my Blimp Skin: Down, Up, Right, Down, Right
Stealth Space Ninja: Up Right Down Down Left
Unlimited Big Willy Battery: Left Left Up Right Down
Unlock all game worlds: Up, right, down, right, up.
Most Cheats (Missing a Couple)
Use one of the following methods to display the code entry screen. Press the Plus to pause game play, then press Nunchuck Right until the "Unlockables" menu appears. Left at the code entry screen.
Unlimited Big Willy battery
Press Left, Left, Up, Right, Down at the code entry screen.
PK pick up heavy things
Press Down, Up, Left, Up, Right at the code entry screen.
Crypto Dance Fever skin
Press Right, Left, Right, Left, Up at the code entry screen.
lbml tasv vetaof
Kluckin's Chicken Blimp skin
Press Left, Up, Down, Up, Down at the code entry screen.
Leisure Suit skin
Press Left, Down, Right, Left, Right at the code entry screen.
Pimp My Blimp skin
Press Down, Up, Right, Down, Right at the code entry screen.
Stealth Space Ninja
Press Up, Right, Down, Down, Left at the code entry screen.
Successfully complete the game.
On the unlockables menu, hold the Nunchuck analog stick up for a few seconds and an enter cheat window should appear. Enter directional commands on the Wii remote D-pad.
Up, right, down, right, up
Unlock all game worlds