Fruit Enthusiast Achievement
Collect all the fruit in any area of the Jelly Lab
This is easiest in the very first area. Just fill all the requirements for the 10 levels and the achievement will unlock once you gain all 30 of the fruit.
I recommend doing this as early as possible before moving ahead to far into the game. The reason being, once you unlock more power-ups, the more random they are. So if you need a certain power-up for the level, it might not come early in the level.