Complete 50 Challenges

Inflict Elemental Effects on enemies 50 times

Unlock all four Momentum bars as Batgirl, Robin, Nightwing, or Red Hood

Complete Case File 02: THE RABBIT HOLE

Go 24 hours (in game) without breaking the law, being wanted, killing or harming anyone.

Find all of Bruce Wayne's hidden audio recordings

Uncover a new problem at S.T.A.R. Labs

Score at least 30 points in the basketball mini-game.

Buy 8 meals from Cluckin' Bell throughout the game.

Perform a perfect dance routine.

Discover a sketchy self-help program in Gotham's streets

Stealth kill all enemies in the mission "Madd Dogg's Rhymes".

Use a Pay 'n' Spray with wanted level.