Batman: Return to Arkham - Arkham City

This achievement is story-related and cannot be missed.

You will come to a point in the story in which you have to prove that you are worthy joining the league of assassins. To do so you have to complete a set of challenges which mostly consist of flying passages followed by some smaller fights. Eventually you'll have to face off against Ra's himself. Key to defeating him is to keep your distance. Dodge his attacks (he has a pretty simple set of attack patterns) and keep mashing your shock gun by pressing + in between your jumps.



(video credit: TheCapedGamer)

Hope this helps you guys!
Any improvements? Please let me know in the comments below