The More You Know*

Just got this achievement, did it with the help of my guild. It is simple, the person who wants the achievement must use [item=191937] - use it once, and just stand still, no need to click on the toy again, - and all others use [item=191925] (over and over) on the person with the Catcher buff. The more people using the flinger, the faster it goes. There is no way to track it, but I assume you get the achievement after around 300 casts on you.
Hope it helps!

Quick note: if another player with the buff from [item=191937] is getting close (while you have the catcher buff), just use the item on that player to knock him/her back, or else you will get knocked back. Yeah, there are people like that, trying to ruin stuff.

It is possible to just create an alt on a second free wow account that is bound to your same battle.net account, no subscription or anything needed, and use that to throw stars at your character somewhere others won't try to contest you for them.

To get this achievement you need to have the buff [spell=44010] which you get from [item=191937], and then catch 100 stars flinged at you by someone else.

If you use [item=191925], you lose the buff, so you cannot fling and catch at the same time. The toys also share a cooldown, so it's not efficient to quickly switch between the modes.

TLDR: If you're doing this with a friend, it's easiest to just take turns being catcher and flinger. It will take about 5 minutes if you have one friend flinging at you. The More You know ★