Fully upgrade a weapon

Line up a Galaxian in Slots.

Craft every item

Pick up Frank's note after it's discarded

Find a Firefly pendant

Clear Sonic CD in either Anniversary or Classic Mode

Defeat The Prospector.

Complete your first Deathcard.

Eat 100 Ghosts. (Original Mode excluded.)

Watch the opening for Sonic CD

Eat 200 Fruit. (Original Mode excluded.)

Defeat Windbag.

Collect all the fruit and clear a bonus stage for the first time.