Complete a Nostradamus Enigma.

In order to get this achievement you must Complete a Nostradamus Enigma.

1. Go to the Cafe Theatre in Notre Dame. When you get there go down to the armour room.
2. A cut scene will then playing explaining it all to you. Then when you are done go to the right of the entrance and interact with it.
3. Activate your eagle vision and interact with the symbol you see on the wall above it. You will then get the first riddle.
4. Once you get it, go to the 2nd floor, then the top of the main staircase, again activate eagle vision and look to the painting there should be a orange marking. Interact with that to get the second riddle.
5. Go outside and get on top of the dome on the roof of the building again eagle vision.

You are now done, you get the disc and your achievement.

This doesn't have to be done with this particular location, it can be done at any one of the Enigma locations.
Enigma locations look a scroll on your map, however they only reveal themselves as you get close to them.
You can also buy the enigma map from the estore if you wish to make your task easier.

If you have any questions feel free to PM me.