Epic Mickey 2: The Power of Two

This is the final story mode related trophy and is awarded for taking down the Mad Doctor in the final boss fight.

As an encounter it's pretty easy, the first stage of the battle is to simply dodge the mechanical claw attacks and wait for it to open, then paint or thinner the red light in the centre. Do this a few times and the next stage will begin after the claw drags you down a whirlpool of thinner, the final piece to this is just to keep hopping between the external platforms of the arena and spray thinner/paint at the masks at the top of the mechanical walker, once they are thinned out/painted completely, a cutscene will begin and your trophy will unlock.