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Conqueror of Ulduar

From WoWWiki

Conqueror of Ulduar 10 Achievement points
Defeat each boss in Ulduar on Heroic Difficulty without allowing any raid member to die to that boss at any point during that raid lockout period.
Criteria:

Flame Leviathan slain
Razorscale slain
Assembly of Iron slain
Auriaya slain
Thorim slain
Mimiron slain
Yogg-Saron slain

Ignis the Furnace Master slain
XT-002 Deconstructor slain
Kologarn slain
Hodir slain
Freya slain
General Vezax slain

Reward: Title: <Conquerer of Ulduar>

Conqueror of Ulduar is a title awarded when you complete the achievement  Conqueror of Ulduar from defeating each boss in Ulduar on Heroic Difficulty without allowing any raid member to die to that boss at any point during that raid lockout period.

The title appears in front of your character's name:

"<Name>", Conqueror of Ulduar