Beat the game. You'll know it when you see it.
Collect all known water sprites and golden diamonds
Collect all of Grannie's medals
Collect all the spooky water sprites
Beat a REAL level without using the checkpoint (1-1 doesn't count!)
Beat a REAL level without dying once (1-1 doesn't count!)
Beat a REAL level without getting hit (1-1 doesn't count!)
Collect 4000 golden diamonds, unnecessarily