Super Cyborg

Enter at the title screen :

40 Lives (Starts you with 40 lives)
Left,Left,Right,Right,Up,Down,Down,Up,Down RB,RB,RB (Lock,Lock,Lock)


Level Select (Choose your starting level)
X,RB,RB,Y,Up,Right,Down,Left,Up,Right,Down,Left


Enter during the Game in the Pause Menu (Push Start during Gameplay)

Weapon Select (Lets you choose any weapon)
Right,RB,Left,RB,Up,X,Up,X,Y



When prompted which level start on Level 7 , then choose Easy difficulty.

Method :

To unlock this achievement you are able to get it by yourself. Start a 2 player game and choose Level 7 and 40 lives as per the codes above. Let your partner die 40 times to use up all of their lives. Then push start on their controller to get the Life Stealer Achievement. Once your partner dies you can now go and complete the final stage Solo. Just before you kill the Final boss push start on controller 2 to bring your partner back in to the game. Now finish off the final boss and enjoy your shiny new Achievement.