Do the following achievements to get the desired effect:
Old Movie Filter option: receive a 15% game completion
High Contrast Filter option: receive a 100% game completion
Horizontal Flip option: receive a 100% game completion and obtain the correct online code for your particular game at www.kingkonggame.com
Artwork gallery: complete the game
Weta Artworks: Environments Part 1: receive a 5% game completion
Weta Artworks: Environments Part 2: receive a 25% game completion and obtain the correct online code for your particular game at www.kingkonggame.com
Weta Artworks: Environments Part 3: receive at least 50,000 points and a 100% game completion
Weta Artworks: Creatures: receive a 50% game completion
Weta Artworks: Kong Part 1: receive a 75% game completion
Weta Artworks: Kong Part 2: receive at least 20,000 points and a 100% game completion
Weta Artworks: Kong Part 3: receive at least 100,000 points and a 100% game completion
Weta Artworks: Kong Part 4: receive at least 150,000 points and a 100% game completion