Defeat 20 enemies with gunfire by aiming while hanging

Defeat 20 enemies with headshots

Find one treasure

Solve every riddle on the island

Complete story mode on Normal difficulty

KO all the henchmen celebrating your arrival at the party

Defeat the giant Titan Ivy plant

Catch a Batarang (any play mode)

String up one henchman and drop him to surprise a second (any play mode).

Conquer the effects of the Scarecrow's fear gas

Defeat two Titan Henchmen at once

Solve 40% of riddler challenges