7th Legion Spycatcher

You know, some naga warriors chase you across zuldazar until they melee hit you once... in stormsong valley forsaken npcs will never drop agro untill you almost left the map... but these ones, these bloody trolls, of all things, drop agro after they moved more than five yards!

Honestly i believe theres a dedicated dev team that has the single job of making irritating achievs.

I'm honestly getting real tired of these kind of nonsense achievements.

"While not in a group" when clearly the only way to guarantee success is to have 5 people working together and rounding up mobs, but not actually be technically in a 5-men group.

Just as bad as the Hand achievement in Nazmir, where people will gladly steal the mobs you rounded up and mess up your achievement attempt for that day.

Horde version of the achievement is here: Zandalari Spycatcher

To get this achievement you need to wait for Don't Stalk Me, Troll world quest to pop up and complete it in 60 seconds. .
It is located in Nazmir Primal Wetlands subzone at 37.31 76.95 to the west of Zul'jan Ruins (Horde main base in the zone)
/way Nazmir 37.31 76.95 Don't Stalk Me, Troll world quest possible location

You need to use Portable Revealing Occular and it makes you see [npc=134868] and [npc=134869] in stealth

1. 
   
2. Hard to solo with low ilvl gear
3. 
   
4. Mobs are kinda far away from each other.
   You can't exactly pull lots of mobs and aoe them down.
5. 
   
6. Most of them are casters, so if you run too far, they evade.
7. 
   
8. Other people doing this quest in the area killing mobs you were counting on
9. 
   
10. You cannot complete this achievement in a group, but you can assist.
11. 
    

The achievement timer starts after the first troll death

Achievement with the help of assist dps: https://www.youtube.com/watch?v=IlGpj0al6XE

You defiantly can solo this with good gear and some luck, but i find it much easier to ask someone to help, or group with other people doing it.
My favorite route is to start from 36.39 73.72 and move north (check the video), then turn east and then back south.
Right now people with warmode cannot see people without warmode, so if you go there with a friend, check this first.