Revenge is Best Served Speedily

Just did this today as it's up in the US -

If you can, go to Orgrimmar and switch to Chromie time (your character has to be below 60) so you can get a solo instance instead of standing in long lines waiting. I then flew over the area a few times scouting my route since I failed on one character already because I got stuck on a fence post!

I took a path that starts you off to the left of the river, then jumped across and went up the right side of the river until I was across from the skull hut. I crossed over and killed everything by that hut, then went behind the hut and finished up. Took 38 seconds.

My route is shown here: https://imgur.com/a/h4lSrCC

Good luck!

Well apparently the mobs have item leveling scaling but the frog does not. I can no longer one shot them with the jump and the tongue attack takes like 4-5 swings. This makes this basically impossible (as if the ridiculous amounts of competition didn't already). GG Blizz, thanks for the scaling no one asked for.

For this achievement you need to wait for Revenge of Krag'wa world quest to pop up.
It is the same quest you saw during the regular storyline quests: Krag'wa the Terrible

World quest is simple, but to compete it in 45 seconds can be hard.

1. 
   
2. Mount the giant frog [npc=134976] in Zal'amak
   West of Krag'wa's Burrow, south from Gloom Hollow windrider
   /way Nazmir 63.93 52.83 Krag'wa the Huge
3. 
   
4. 
   Frog has 2 abilities
   
   1. 
      
   2. Jump in some location and AOE with 6 secs cd
   3. 
      
   4. [spell=250351] frontal AOE
   5. 
      
   
   You need to kill 150 mobs in the area.
   They are walking in packs of 15-20 mobs, so you need to make 7-10 jumps
   But you have time only for 6-7 jumps, so try to jump on cd and kill some mobs with a tongue while jump is on cd.
   
   
5. 
   
   

Most of the mobs are to the south, close to the road.
Right now you have only 1 attempt to get this achievement per day.
So if you failed it, wait for the next day and hope Revenge of Krag'wa will soon be available once more

Revenge is Best Served Speedily demo video: https://www.youtube.com/watch?v=zx2iKbqKWFk