Item description:

after completing one challenge (don't need to get medals) it unlocks challenge achievements in this order:

Combat Silver (16 medals)
Combat Bronze (8 medals)
Predator Silver (16 medals)
Predator Gold (24 medals)
Predator Bronze (8 medals)

To get this achievement - Engima Achievement,

1. Turn around and enter into the palace, see ur map.

2. You should go to Archives Room to get the last trophy!!!

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To get this achievement - World's Greatest Detective

The World's Greatest Detective Achievement can be got before the Crack The E-NIGMA Achievement. All you need is 23 of the 24 Chronicles of Arkhams. Now go to the Penitentary where you saved the Warden. On the ground you will see BATMAN written out about 20 times. Go into Detective Mode and use LB to scan that and you will unlock the World's Greatest Detective achievement.


Special thanks for codexavellum for helping me to get the World's Greatest Detective