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Cheat mode:
Go to main menu and hold L + R and press Down, X, Up, Y, Down, Down, Up, Up.
Release L + R and a "Cheat" option should be appear at the main menu.
Choose the unlocked "Cheat" option, after enter any of the following codes.
Note: these code are case-sensitive.

God mode: Type "8wonder" (You need reenable with each new level)
999 ammunition: Type "KK 999 mun"
Bonuses completed: Type "KKmuseum"
Unlock Machine gun: Type "KKcapone"
Unlock Revolver: Type "KKtigun"
Unlock Shotgun: Type "KK BigBlast"
Onehit kill: Type "GrosBras"
Stage select: Type "KKst0ry" (with number zero - 0)
Unlimited spears: Type "lance 1nf" (with number 1)
Unlock Sniper rifle: Type "KKsn1per" (with number 1)
Unlock Shotgun: Type "KKsh0tgun" (with number zero - 0)
Venture crew - Enter KKguy as a code

Unlock artwork images:
Finish the game to unlock Artwork gallery.

Unlock Weta Artworks: Environments Part 1:
Finish 5% of the game

Unlock Weta Artworks: Environments Part 3:
Have at least 50,000 points and finish 100% of the game

Unlock Weta Artworks: Creatures:
Finish 50% of the game

Unlock Weta Artworks: Kong Part 1:
Finish 75% of the game

Unlock Weta Artworks: Kong Part 2:
Have at least 20000 points and finish 100% of the game

Unlock Weta Artworks: Kong Part 3:
Have at least 100000 points and finish 100% of the game

Unlock Weta Artworks: Kong Part 4:
Have at least 150000 points and finish 100% of the game

Unlock Old movie filter option:
Finish 15% of the game

Unlock High contrast filter option:
Finish 100% of the game

Interview with Peter Jackson:
Reach minimum least 75000 points and finish 100% of the game