The Immortal (achievement)
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The subject of this article could only be obtained prior to patch 4.0.3a.
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- The Immortal
- Within one raid lockout period, defeat every boss in Naxxramas without allowing any raid member to die during any of the boss encounters in 25-player mode.
- Title Reward: The Immortal
The Immortal is an achievement earned for killing all of the bosses in Naxxramas without any members dying during the Wrath of the Lich King expansion.
This achievement is no longer a criterion for the meta-achievement, 
[Glory of the Raider (25 player)]. Players that completed this achievement retain the title associated with it.
Q & A
Bornakk answered some questions about the achievement on the forums:
Re: The Immortal | 2009-03-04 20:50 | 
Bornakk
Q u o t e:
Looking for a confirmation, was told "that a blue post on this topic exists" but i am unable to find it.
Resolution inc
Q u o t e:
- The Immortal, can be done by killing KT w/ out dying (if you have not be present for any other bosses in that reset)
Correct. If you do not die on any other bosses and get to Kel'thuzad, you could (conceivably) sell slots and bring in random people for Kel'thuzad and (assuming nobody dies), they would get the achievement.
Q u o t e:
- The Immortal, can be done by killing KT w/ out dying (even if the raid *w/ you not present* died on a boss)
If anybody died on any boss, the raid ID is no good.
Q u o t e:
- The Immortal, can be archived by wiping a boss that anyone dies on ... and deaths will only count against you on the attempt in which the boss is actualy killed
Wipes include deaths, so this makes the raid ID no good as well.
Deaths on trash are fine, deaths on bosses nullify the raid ID for the whole week it is active.
See also
[The Undying]- Title: <The Immortal>
Patch changes
Patch 7.0.3 (2016-07-19): Moved to Legacy achievements. 
Patch 4.0.3a (2010-11-23): Converted to a Feat of Strength; Title is no longer obtainable. 
Patch 3.0.2 (2008-10-14): Added.