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