Complete Stage 2 of Arcade Mode (any difficulty)

Turn small by being attacked (ie, by Amy's↓+P, etc) in Arcade Mode or Offline Versus

Win a round without receiving any damage in Arcade Mode (any difficulty)

Clear the Sonic story.

Become friends with E-102.

Become friends with Knuckles.

Clear the game without changing equipment.

Sometimes you can take it, and sometimes you just want to lash out.

A sesquidecemvir of seven simulacra synergizing simultaneously.

Create 10 multiplayer lobbies.

Perform 100 Special Moves.

Perform 10 Personal Actions.