Break all the Skullmageddon monitors in the Rocket Dojo
???
Defeat Skullmageddon!
Dodge and get the Gleam 50 times
Use every weapon once
Upgrade a song at the Tapesmith
Complete any level without taking damage
Nail all enemies with the hair pick
Complete any level in co-op without taking any damage... with friendly fire enabled!
Finish every stage cooperatively on Double Dragon difficulty with friendly fire enabled!
Max out every song to level 50!!
Finish every stage solo on Double Dragon difficulty!