To achieve 100% completion in Super Mario Odyssey, you'll need to:
- Collect all 880 unique Power Moons (and purchase up to 999).
- Collect all Purple Coins in every kingdom.
- Purchase all outfits and souvenirs from every Crazy Cap shop.
- Collect all music tracks.
- Complete all minigames and challenges (Koopa Freerunning, Jump Rope, etc.) with their highest rewards.
- Defeat all bosses and mini-bosses.
- Find all Hint Art and their corresponding Power Moons.
- Unlock and complete the Dark Side and Darker Side of the Moon.
Achieving 100% unlocks a special reward and a unique title screen.