Toddler skins
Ninja skin: Make sure you KILL granny with a kunai on any Level.

Creepy Doll skin: Make sure granny has no cookies on the tray when she goes to the demon.

Ventriloquist Doll skin: Make sure the house burns down. In order for the house to burn down you must not let granny take the cookies out of the oven.

Granny skins
Pumpkin Head skin: Make sure granny wins the Halloween level. (Can be made on single player and as you lose as a toddler, you get the granny skin for some reason).