Proof of Demise

Here's a breakdown of which one is for which dungeon:

Proof of Demise: Ingvar the Plunderer

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• Utgarde Keep
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Proof of Demise: Ley-Guardian Eregos

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• The Oculus
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Proof of Demise: The Prophet Tharon'ja

• 
  
• Drak'Tharon Keep
• 
  

Proof of Demise: Mal'Ganis

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• The Culling of Stratholme
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Proof of Demise: Loken

• 
  
• Halls of Lightning
• 
  

Proof of Demise: Herald Volazj

• 
  
• Ahn'kahet: The Old Kingdom
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Proof of Demise: Keristrasza

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• The Nexus
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Proof of Demise: King Ymiron

• 
  
• Utgarde Pinnacle
• 
  

Proof of Demise: Gal'darah

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• Gundrak
• 
  

Proof of Demise: Sjonnir The Ironshaper

• 
  
• Halls of Stone
• 
  

Proof of Demise: Anub'arak

• 
  
• Azjol-Nerub
• 
  

Proof of Demise: Cyanigosa

• 
  
• The Violet Hold
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This is completed by taking the daily quest from Dalaran. This is a completely random quest so it might take a while before you get the ones you need.

What he means is this WILL be removed as of 3.3 and will BECOME a Feat of Strength along with Timear Foresees Achievement Changes from Wow.com