Sneak behind clay face and strike and do it again and he'll go in a cage then you can't get in the cage so you blow up where hes standing outside the cage with batman's suit then he'll move to another spot then do the same thing then use a boomerang by pressing x and direct it. MAKE SURE YOU DIRECT IT TO CLAY FACE 3 TIMES! Then you beat him
In the Hero storyline reach a 'True Hero' rank on ALL the levels and then go to where the vehicles are in the Batcave. Go to the far right and then down to the bottom and step on the elevator, this will take you to the memorabilia room and the Wayne Manor mission is in upper left corner.
Unlock Huntress: Purchase for 200,000 studs at the Batcave when you have completed ALL 3 chapters in the game and viewed the end credits.
Unlock Azrael (Angel of Death) Purchase for 1,500,000 studs at the Batcave when you have completed ALL 3 chapters in the game and viewed the end credits.
Unlock Hush: Rescue ALL 25 civilians in the game. To find out which levels you still need to rescue a civilian look for the small face with either a happy or sad face indicating whether or not you still need to rescue them.
Unlock Ras Al Ghul: Collect ALL 300 of the mini kits. There are 10 in each of the 30 levels.