Ammo a plenty: left,y,white,right,black,x
Bullet proff crypto: x,y,left,left,y,x
Deep thinker: black,white,y,right,white,y
Nobody loves you: white,right,whight,black,x,right
Aware like a fox: right,x,whight,black,right,white
To enable these codes you have to pause the game and hold the left trigger down whist entering the cheat codes.
Unlock upgrades: when your at the mothership hold the left trigger and enter x,y,left,left,y,x
MMmmm brains (increase the ammount of DNA)black,black,white,white,left,right,left,right,white,black
(also do this at the mothership to enable the code).