SpongeBob SquarePants: The Cosmic Shake

I farmed this at the start of the game wen u first go to see sandy at her tree dome…..there r 3 kids up on a cliff next to her tree dome above the stone tikis u have to destroy…..once u unlock the ability to spin attack u can go on the cliffs where the kids r and I kept smacking them over and over until the achievement unlocked