Midday Gardens: Launch the Transporter Whirligig

Bamboo Terrace: Follow the question mark bottles to the end

Enchanted Towers: Destroy all the balloons

Sgt. Byrd's Base: As Sgt. Byrd, bomb all treasure chests

Buzz's Dungeon: Defeat Buzz

Seashell Shore: Defeat Bluto's nuclear shark submarine

Sheila's Alp: As Sheila, destroy all headbash treasure chests

Sunny Villa: Defeat all Coward Rhynocs

Acquired all skills

Attained the "Shura" ending

Defeated "Isshin Ashina"

Attained the "Return" ending

Attained the "Immortal Severance" ending