Plant one of each seed in a single scene
Complete every scene on the Overworld
Complete the credits scene
Finish the Rooftops Chapter
Use all of the toys in one level
Place 30 gnomes in one scene
Unlock a new type of seed
Grow 120 plants in a single Overworld scene
Go to the the Overworld after completing the first chapter
Build a very tall contraption
Grow 10000 plants in total