After Poison Ivy destroys the Batcave, cross to the three hills to land on the mainland at Arkham West. Then, go to the second one. There are two small holes through which you can see cliffs. Through one, you see the mainland which is directly in front of you after you land on the second hill. Before doing that, look and grapple over there then go to a small exterior. There will be a cliff which has no place to land. Glide onto that location and you will find a trophy which will unlock Record Breaker in Challenge mode.