Hamster Ball

This is probably the hardest trophy in the game. Complete Stunt Mode to unlock Trial Mode levels, then get Watermelon times on all levels. What I did was play one level at a time until I got Watermelon. This may cause some frustration as some of them are pretty hard but don't give up.

The Watermelon times are like a medal time to beat, except each tier is a different fruit. There are four of these, ranging from Peach (easiest) to Watermelon (hardest). It says what time it is at the top of your screen and also after you complete the level, it also shows your fastest and most recent times.