For finding the maps step of the quest I’ve found
Nessus: over looking the radiolarian lake by the lost sector (from the well of flames pillar, find the big tree, look left, and there’s platforms over the lake)
Tangled ashore: by defeating an ogre where you go to fight the Mindbender
Dreaming City: following ascendant platforms up in the blind well entrance
Edit: there’s a bug with the quest right now that after you do the ascendant challenge, you can retrieve the rest of them from Petra.
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Or you can go to Petra and pick up all the maps without finding them