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Reach the Untended Graves.

After the Dancer of Boreal Valley fight head up the ladder and then left to the stairs, head down and kill the knight to get to the Consumed Garden fight through here and kill the Consumed King boss. In the room just past him you find the Path of the Dragon gesture and a chest at the back of the room, hit the wall behind the chest to find the secret route to this area and unlock the achievement.