Hoarder of the Forbidden Reach

For this achievement you may open 100 of any of the treasures needed for Treasures of the Forbidden Reach except for the Forbidden Hoard, which there is a separate achievement for. You can find the treasures all over the Reach. I found the War Creche to be a good spot for them as there are 4-5 close Obsidian Coffer spawns, but the area is also packed with hard hitting Elite mobs so this may be a struggle for some classes.

Edit from live: The [item=204558] purchased from [npc=200566] will mark these treasures on your minimap for 1 hour, making them significantly easier to find.

1 hour of circling with the buff, 5 small treasures. I'm devastated. Maybe another day with less people around.

I tried farming Obsidian Coffers in a War Creche farm raid, and it was pretty slow going for me. I got maybe around 10 after an hour.

What did work well for me was to add all the waypoints for the treasures listed in the comments for Treasures of the Forbidden Reach and just fly around that path with the Perception scroll buff.

Lots of treasures, especially Bone Piles and Avian Troves mostly in the middle valley areas. I would do around two passes through all the waypoints, and then use LFG to join a different rare hunting group to swap shards. Got about 40 treasures in an hour's worth of the Perception buff.