Ling-Ting's Herbal Journey

For this achievement you have to catch/find 30 [npc=59824].
The credit is shared among party members.
They only become visible when you drink [item=80313], which can be bought from [npc=59822] after you picked up the quest from her. The duration on the drink is 5 minutes, and you can only carry 5 at a time in your bags.

This list should help you find them all, they are listed by area, starting from entrance.
Although most have fixed spots, a few seem to switch around a bit in the same area. On 1 run (on beta) one of them was under the stairs in Mama's pantry and I was not able to click it, so the switching could be a bug. edit: at 1st run on live only found 2 in Mama's Pantry, and 6 in Stormstout Brewerhall (Boss Area), will check another run to confirm this change.

Trickling Passage 3
Grain Cellar 6
Mama's Pantry 3
Stormstout Brewhall (Boss Area) 5
Stormstout Brewery 1
Stormstout Brewhall 2
Stormstout Brewery (Boss Area) 2
The Great Wheel 3
Stormstout Brewery 1
The Tasting Room (Boss Area) 4
Total 30

Track humanoids can be used to find them, but since there are a lot of Hozen Party Animal and Ancestral Brewmaster around, it's sometimes hard to separate the Golden Hopling.

Can still be found after the dungeon is completed.

Reward for the achievement is [item=86562].

If you Shift+V its almost immposible to miss them.

Easiest method:

1. Go to Stormstout Brewery.
2. Buy [item=80313] from Auntie vendor just near the entrance.
3. Use this macro:

/cleartarget
/tar Golden Hopling
/script SetRaidTargetIcon("target", 4)

(First and third line are optional)

4. ?
5. Profit!