You will get this Trophy after completing the Story Mode on Easy or higher difficulty.

You will get this Trophy after completing the Story Mode on Normal or higher difficulty.
NOTE: If you beat the game on Normal, You will unlock Big Bang Trophy too.

Missable Trophy!

Near the end of the game, you will see some henchmen outside a door on a big Joker's face and more henchmen inside, You have to defeat them, as well as all the henchmen inside the first set of doors.
NOTE: If you enter the first set of doors, You can't go back outside unless you die, and if you enter the second set of doors, there is a checkpoint so if you miss any henchmen, you'll have to play the whole game again.

You can get 20 combo anytime, Just keep attacking and don't miss or get attacked.
See "Freeflow Combo 40" Trophy for more information.

This is easier then it looks, There is a very easy way to get 40 Combo, Hit a guy with (Square) and if you feel someone is gonna hit you, use (X) to jump over him, Keep doing this until you reach 40 combo.
NOTE: Its best to do this trophy on Hard, Don't do it on Easy or Normal because the enemies will die fast, They might die before you reach 40 Combo.
If you want a good place with alot of enemies, try the Sewer Bat ( Extreme ) Challenge.

The only place you can do this is on the Clock Tower on top of the Arkham Mansion. Climb the tower to the highest point and then jump while holding (X)

You can do this move only if you have the Inverted Takedown upgrade.
Go and sit on a gargoyle and wait for a henchman to walk under you. When hes under you, Look at him and press (Triangle) to String him up, Then go to another statue and wait for another henchman to go and see the henchman you captured, When you see one found him, Use the batrang to cut the Rope on the henchman you captured to let him fall and scare the henchman thats watching him.

When you fight the two Titan Henchmen at the garden, do not use the Batrang on them. To defeat them you have to let the Titans run into each other, and each time one of them gets hit he will be open for normal attacks so go and hit him with (Square). Keep an eye on the other Titan, as he might charge you while you busy hitting the other one.
You can also use the Explosive Gel on them to hurt them.
NOTE: You only have to beat one to get the Trophy, You don't have to beat them both.

You must have the Remote Control Batarang upgrade to get this trophy.
This is very easy, Just select the Remote Control Batarang, Throw it and control it with the right analog stick, and let it hit Batman and he will catch it.

You will get this Trophy on your first fight; just hit 5 enemies with one combo.
See the "Freeflow Combo 40" trophy for more information.

Just do a 10 hit combo. You will get this very soon.
See "Freeflow Combo 40" Trophy for more information

See "Freeflow Gold" Trophy.

See "Freeflow Gold" Trophy.

There are 8 combat challenges, and you will need to complete them with the specified score to earn 3 medals on each one. This is the hardest trophy in the game.
The trick is getting a big combo. There is no time limit on most of the challenges, so take your time to get the best combo.
Hit the Henchmen with (Square) and keep using (X) to jump over them. Keep doing this and you'll get the highest score, When your combo flashes Orange, Use the Takedown move to beat someone quickly, Especially on the Knife or Stun henchmen, which always block your attacks.

See "Predator Gold" Trophy.

See "Predator Gold" Trophy.

This is a lot easier then the Combat Challenges, because its all about stealth; you don't have to worry about a time limit or your score. You have to do 3 different objectives on each challenge and each one gives you a medal. Some of them can be challenging, so just take your time to do everything.

You have to beat a Predator Challenge with Silent Takedowns only, without being seen. Its very easy, Just take your time and go behind someone and press (Triangle) to use the Silent Takedown.

You have to complete a Combat Challenge with out getting hit. You should be able to do this on the first Combat Challenge. Use (X) a lot to jump over the enemies before getting hit.

You have to solve all 240 riddles. This shouldn't be hard because you find a Riddler map in each area that will show you the location of every Riddle.
Work on this trophy after beating the game because you will have all the Gadgets to go anywhere.
Just keep searching everywhere and collect everything you see and destroy every Joker's teeth on the way.
Use this link for more help:

Batman: Arkham Asylum – Riddler Guide | GamesRadar

See "Crack The E Nigma" Trophy.

See "Crack The E Nigma" Trophy.

See "Crack The E Nigma" Trophy.

See "Crack The E Nigma" Trophy.

See "Crack The E Nigma" Trophy.

See "Crack The E Nigma" Trophy.

See "Crack The E Nigma" Trophy.

You must Collect all the Chronicles of Arkham to get this trophy. The Chronicle of Arkham are part of the Riddler's Challenges so you will get all of them while doing the "Crack The E Nigma" Trophy.
The last Chronicle of Arkham will be hidden, and its not part of the 240 Riddles. You will find it at the place you saved the Warden in the Penitentiary, You will find some writing on the floor so just scan it.

You will get this when you:
- Beat the game. ( Easy, Normal or Hard, It doesn't matter! )
- Solve 240 Riddles and get the last Chronicle of Arkham.
- Earn 24 Medal on the Combat and Predator Challenges.