Is there a cheat in Batman Arkham Asylum Ps3 to Give me all the riddler trophies?

sad little cheater, just find them yourself. but no, there is no cheat, youll have to go find and solve each riddler challenge

It's better to wait until the end of the game to get the rest of the trophies and solve the rest of the riddles. Once you beat the game, select Continue Story. You're given free roam over the island to solve whatever you've missed.