Abundance: Investor

It feels like this was supposed to be an expansion-long "grind until you hit it" achievement.
Being in a farm group and only getting 60 large orbs that count for 300 score, where my "event total" is close to 1,790,000 and my "grand total" is over 5,300,000, this is not completable in one shot unless I'm missing something huge.

Edit: Fixed. Large orbs now give way more. Go get it.

I just did this today in Harandar abundant abundance. I joined a 40man raid group, and then you basically just have to run below all the orbs falling on the floor (marked by green circles). You better invest a bit in increasing your abundance buff to at least tier 2 to get enough move speed and harvest radius. There was litterally an unending flow of falling orbs, since many people were contributing to altar.

Doing 10k in one run seems impossible. Even in a big group. This, the profession and the artisan one are not doable unless its not in one run and the tooltip is wrong.