Highly Communicable

After defeating Dealer Xy'exa, do not take the green portal / Flight path as its duration will remove the debuff. You can and should walk up the ridge by going to the right of the portal and manually walk to the entrance.

Highly Communicable (All bosses)
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Video with short voice-over guide.

- Clear all the trash in the dungeon
- Easier if you do the other dungeon achievements first, then reset and do this by itself.
- During the Hakkar fight, ensure you have the [spell=322746] debuff on two people and stack them together.
- You need to keep this debuff bouncing between two people while you finish the dungeon
- It 'bounces' to nearby players at the end of its duration
- You can mount and eat with this debuff to healer
- A 2-seater mount can be used for convenience
- You can swap the debuff onto any other players, it does not have to be the same two with it the entire tiem
- The Z-Axis will stop this debuff from spreading, so make sure to always stick very close
- We had two melee bounce the debuff between them, until the last fight and then moved it to the tank and healer so we could 1-phase the intermission.

Link to the rest of the Glory of the Shadowlands Hero guide.

I was able to do this achievement with 2 accounts.
One with my 477 BM Hunter main and the other with a lvl 60 Resto Shaman.
It's stressful, but actually relatively easy to do that way.
You just have to take your time and know a few things ahead of time to avoid mistakes.

At first, I was afraid (I was petrified) that my Shaman would get destroyed by the DoT.
Turns out it didn't do much damage at all.
In fact, my main was taking more damage (not only in absolute number, but also in relative %).
So I had to focus heal on my main but it was very easy to heal by throwing a heal every minute or so.

1) First, I cleared the whole thrash with my main.
2) Went to Hakkar and stacked my toons together.
3) Waited for the DoT cast then switched to my main to burst Hakkar
4) At this point, I put my main on follow and Shaman was slowly walking to each boss while healing every now and then.
5) When I was positioned at a boss, I switched to main and burst the boss.

Important infos:
- The most stressful part is on the way to the Manastorms. Your toon can get stuck in the terrain and you have to avoid the knockback from the sewage pipe. So be watchful there.
I had an Engi to turn off the slimes so I can't comment on that part.
- When you kill the Manastorms, use the pipe to exit and NOT the teleporter. I was stupid enough to forget that the first time and died from sewage pipe trying to get back.
- My alt almost died in the Hidden Grove because of some hidden thrash I didn't see with my main. Keep an eye out for that.
- As stated before do not use the green orb to come back from that boss. Walk up the ledge.
- Keep your bursts (BL and such) for the last boss. You have to kill the boss ASAP to avoid the transition.
- Make your alt follow your main for the last boss fight. There is a couple of stuff to avoid that can kill him so you have to move around.
My shaman actually died there but I was lucky enough to reincarnate and pick up the DoT again (otherwise I'd have to start over).
- I suggest using the Achievement Tracker addon to easily monitor the DoT's time left on each toon.
With that I made sure to pause when 1-2 seconds were left to re-apply the DoT.

And with that, the Meta is completed!