Here is the full list of all 14 It's Kooky achievements.
Spot all the silly ones in the Library level
Spot all the silly ones in the Train Station level
Spot all the silly ones in the Airport level
Spot all the silly ones in the Carnival level
Spot all the silly ones in the Dollhouse level
Spot all the silly ones in the Beach level
Spot all the silly ones in the Zoo level
Spot all the silly ones in the Swimming Pool level
Spot all the silly ones in the Ski level
Spot all the silly ones in the Field level
Spot all the silly ones in the Underwater level
Spot all the silly ones in the Farm level
Spot all the silly ones in the Treehouse level
Spot all the silly ones in the Fishing boat level