Play through the story until Dodo gets back home.
Complete the Fishy Business quest.
Complete the Ship Happens quest.
Complete the A Boo-tiful Voice quest.
Complete the Mirth Festival quest.
Upgrade the theater to the max.
Talk to all the spirits (Ship, Cave, Pond, Waterfall, Lighthouse, and Tree).
Recruit Vivi, Rita, Louie, Qillian, Aaron, Millie, Mimi, Ellie, and Flopsy.
Recruit or invite all characters involved in the main quest.
Finish the game to the credits screen.
Unlock all available melodies.
Get 80% accuracy or higher in all melodies on Casual difficulty.
Get 80% accuracy or higher in all melodies on Pro difficulty.