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