Turn the sound down to 0 and music off in the options menu whilst in the library

Use the Time-Turner

Defeat 20 spiders with Ron

Complete Year One Story Levels

Collect 500 ghost studs

Knock over ten characters using a ride-able object

Clear the D.U.P. completely out of a district

Rescue the guards and henchman from the Joker toxin in Decontamination

Complete a combo of 10 moves (any play mode)

Make your amateur debut in the Opening Experience.

Complete a District Showdown

Look out for yourself, no matter the consequences

Get mauled by a guard dog.