Jak mask: on the prison level 3 were the three guards are patrolling head for the northeast door when it opens hop on the bed then jump on the shelf smash the picture and the Jak mask is yours

Human daxter mask: it is in the hotel mission after the first slide go up the slope then turn around you will see a flatform, when you got the fire attachment you should be able to get it

Rachet mask: when in the subway mission where you jump from train to train there is a place where you have to climb up the pole while avoiding the energy going up. when you get to the top go to the the opening in the left side of the door look by pressing the up you will see a flatform then smash the picture the you get the mask.

Sly mask: it's very easy when in city port go to the warp portal of emeral island or dude's home there are boxes in the back climb it then smash the picture.