Slightly Spoiled

So, the chest does not appear in a random location, but is tied to the Shadowlands pvp locale
Ardenwald - Dorne
Maldraxxus - Hallowfall
Revendreth - AzKahet
Bastion - Ringing Deeps

I have looted exactly 1 Unbound Spoils (in Ringing Deeps), yet this achievement shows that I have looted one in
- Isle of Dorn
- Hallowfall
- Ringing Deeps

So not sure whats going on with it, but it seems to be triggered by something else.

As of the first of October this is working.I have looted the final chest in the city of threads and it counted for Azj-Kahet. Hallowfall is also not bugged anymore and it counts,and yes even if you looted the setting that week you can still loot the chest and it will count.

For anyone looking at more information regarding this achievment.You just have to loot 4 unbound spoils 1 in each zone.They spawn every 6 hours for Eu thats 00:00/06:00 am/12:00/18:00 pm.The zone is random and they spawn in the FFA areas(where you can pvp even your own faction).

Good luck.