Abundance: Harvester

To get this achievement, you need to collect orbs lying on the ground. It drops from all mobs and gathering any resource, etc., but 10k is a huge number.
The only place where it seems doable right now is ZulAman, when huge corpse spawns and a lot of ppl start clicking it.
Better try it on Wednesday, when there are a lot of ppl still doing this event.

I managed to get this in the ZulAman one. 3 of us were spam-skinning the mammoth whenever it popped up and 6 people would gather all of the orbs and deposit them at the adjacent altar. This led to a cycle where we were generating a boon every 5-10 seconds the entire time, which would cycle through all the boons, spawn the mob that you chase in the area for even MORE orbs, and go through all the boons enough to respawn the mammoth almost right away. The gameplay loop allowed us to get an insane score and get the Harvesting points we needed.

Not sure how to get this, as google and even wowhead have zero information or any guides on the achievements and I've got almost all the other achievements done (except the voidstorm ones, and the artisan one). This one just baffles me as even grabbing every orb from mobs and skinning or whatever "treasure" I click on I only seem to get to around 3-4k, so there must be a specific event "type" that boosts it, but not sure what it is.