Defeat a total of 50 enemies

Watch the opening for Sonic the Hedgehog

Complete Chapter 4.

Customize the look of Cal, BD-1, and the Mantis

Complete all main missions in Karate Downtown Bikini Bottom

Knock over ten characters using a ride-able object

Complete the game to 100%

Complete all Treasure Mode Levels in Skull 3 Hub.

Unlock all of the enemies in the game.

Destroy 1000 Tikis

Obtain a protorelic in the grasslands.

Clear stage 1 on either side in story mode.