The Plains of Kunark - RoS Collectibles Achievement
For this achievement you'll need to complete three zones of collectible achievements; for a total of 12 sets of collections. The Over Under (The Overthere), Fire In The Sky (Skyfire Mountains) and Cryptic Excavation (Howling Stones) are the zones and achievements you will need to complete.
The Plains of Kunark is one of two achievements that you need to complete for the Ring of Scale Master Scavenger achievement. Finishing the RoS Master Scavenger achievement will award the player with the Scavenger's Prize trophy as well as Scalebreaker's Storage Case - an item you can place in your house/yard which stores up to 500 items.