This achievement is obtained during Act II, when Didi and Dawn are tasked with fixing the three attractions at the carnival.
When you reach the Shadow Theater attraction, you will need to shift onto the screen and partake in three short “plays” before the attraction is considered fixed. During the first part of this play, there will be a small platforming section where you are required to cross a river by jumping on the heads of four crocodiles. In order to do this, simply wait for the first crocodile to close it’s mouth, then jump onto it and quickly jump over the next three until you safely reach the other side of the river.
Do not hesitate or wait to jump from one crocodile to another because they open their mouths about every three to four seconds. If you time this right, you should not have any issues on your first attempt. If you happen to fail on your first attempt though, reload the checkpoint before falling into the water so that game does not recognize that you have failed.