Defeat the Doctors N. Tropy

Meet Ika-Ika

Find the hidden Yellow Gem

Do some target practice

Beat any boss in N. Verted mode

Find the source of the Bumpa Berries

Shut N. Brio up

Defeat N. Gin and his Weapon of Mass Percussion

Acquire a Flashback Tape

Try on a Skin

Beat a story level without dying

Crouch or slide into a double jump

Find and use the Hand or Eye of Vecna and escape a Trial.