Pause the game and press L1, R2, L2, R1, Up(2), Left, Square, Right, Circle, Start.
Pause the game and press R2(2), Circle, R2, L2(2), Left, L2, Triangle.
At the main menu, press Triangle, Up, Circle, Right, Down(2), Square, Left. Repeat this code to unlock more bonus gallery entries.
Successfully complete the game after saving all 260 natives to view an alternate cliffhanger-type ending.
Whenever Kya crosses her arms when talking to anyone, hold X and move the Left Analog-stick. She will move her head in the direction that you move.