Defeat the Dark Rider for the first time

Watch the 'Birth of the Beast' Treasure

Kill Ares

Climb the Spiked Column in Hades without taking damage

Obtain the head of the Architect's wife

Win the first Satyr fight

Defeat Pandora's Guardian

Hurt Smithers with one of his own bombs.

Playing from stage 1, defeat the battling robot.

Discover the secret 'Hades Arm' room

Acquire the Bow of Apollo

Find someone to play remote Batarang catch with

Jump off the tallest building in Arkham City and glide for 1 minute without touching the ground.