Destroy All Humans - God Mode

Unlimited Ammo:
Pause gameplay, then hold L and press Left, Y, White, Right, Black, X.

Unlimited Mind:
Pause gameplay, then hold L and press Black, White, Y, Right, White, Y. Your MC meter will not decrease. Your current MC must be above zero for this code to work.

All Upgrades:
Pause gameplay, then hold L and press X, Y, Left, Left, Y, X while on the Mothership. All upgrades for the currently unlocked weapons will be available for purchase from Pox's lab.

Alien From Ipanema Mode:
Pause gameplay, then hold L and press Y, Black, L, L, White.

Full Awareness:
Pause gameplay, then hold L and press R, X, White, Black, R, White.

1337 DNA:
Pause gameplay while on the Mothership, then hold L and press Black, Black, White, White, L, R, L, R, White, Black.

Blind Humans:
Pause gameplay, then hold L and press White, Black, R, Left, X, Black, White.