We did a pass and checked quests associated with dungeon boss kills. In an upcoming Beta build, you'll see that you'll get some dungeon/raid achievements granted retroactively. Not all dungeons and raids have quests associated with them so some players will still have to re-do the content. For example, there are no quests that validate the boss kills in Slave Pens or Blood Furnace.

Also, keep in mind that in cases such as Onyxia or Zul'jin, not every raid member got quest credit for the quest item drop.

We figured it was better to try to reward credit wherever possible.

Ok, for everything 25-person and above, we added the full loot table checks on BoP items.

Gruul
Mag
Vashj
Kael
Illidan
Archimonde
Kil'Jaeden
Onyxia
Ragnaros
Nefarian
C'Thun

Dungeon bosses and anything that requires less than 25 people will check any quests but no items.

We can not check the Heroic Daily Quests or Dungeon Daily Quests as they are repeatable and not tracked accurately by our system.

Also, you have to have the items in your inventory or bank. If you deleted them you will not get credit and the GM's will not restore items for achievements.

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Q u o t e:
What about tier items bought from BoP tokens dropping from those bosses (Tier 6 Hat on Archimonde, Chest on Illidan etc)

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That stuff got counted. You'll get the achievement.

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Q u o t e:
Hmm.. I don't think I have my T2 helm from Ony anymore.. but I do have my Quel'sarrar sword, will that count since you needed to kill her for the quest? :)

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The Quel'Serrar quest counts for Onyxia. You don't even need the sword. The quest is good enough.

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Q u o t e:
So if I have Benediction still lying in my bank will I get credit since the eye was a drop out of MC?

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The achievement is to kill Ragnaros. Correct me if I am wrong but I don't think Benediction required a Ragnaros kill.