Complete 'Earth's Mightiest'

Create a Custom Character

Complete 'Shakespeare in the Park'

Complete 'A Loki Entrance'

Achieve True Avenger in any level

That just happened

Master the Excursion Funnel

Unlock all Justice League characters (Single Player Only)

With Brainiac, defeat any LexBot

Unlock all the Bosses (Single Player Only)

Taunt GLaDOS in front of a camera in each of the five co-op courses

Do the same test twice