Pit Lord Argaloth

The strategy that we used to successfully PUG(10) him last evening (12/11) was such:

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• 2 Tanks, 3 Heals, 5 DPS(9-15k)
  Originally had 2 Heals, 6 DPS but when the Shadowpriest pulling 6.7k said he was usually Holy, he was promptly role-changed.
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• Positioning:
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One group on each of the 2 front corners of the square dias on the floor of his room, about 40% ajacent to each other

.......................|..******..|
.......................|.BOSS.|
.......................|..******..|
.................G1..------------..G2

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• Mechanics:
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1. 
   
2. Most Critical element: Dispelling Consuming Darkness immediately.
3. 
   
4. Each time he casts Meteor Slash, the damage will be spread out betweenthe 5 group members in front of him, reducing it to a very manageable level. He does not do a Physical cleave, so it is thoroughly acceptable to remain grouped at all times.
5. 
   
6. Fire Phases: Stay out of it : Nuff said.
   Fireballs will only land where someone WAS, so a "stand, shift, stand, shift" strategy works well here.
   Be sure to return to original positions as his cast ends.
7. 
   
   

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• Our "limiting factor" was healer mana. Having a shadowpriest for an extra Hymn of Hope, and a Balance Druid for an Innervate will help tremendously, although they are not required if fire phases are managed well
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How is this a PVP achievement, If its in a raid instance ?
OK someone else has to have won TB for it to be available, but surely this is a Raid not PVP.
I'm angry that I wont be able to complete a PVP achievement because I don't Raid

This seems to be the first achievment of the new raid that appears in Cataclysm, Baradin Hold. -Which is a raid equal to Wrath of the Lich King's raid; VoA, as the raid only is accessible when your faction (Horde, Alliance) holds the Baradin Hold. You can tell by the map that this boss is located in a first wing, and you can see another wing with no colour or "skull", so Blizzard will add more wings in later patches. As you can see, this second wing has a "Closed door" mark where the entrance to this room is. Also, you can see another "closed door" just north from the two wings to a hall that probably will lead to next area where the next -boss branches- can grow out.