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Undying Aesthetic
Collect any class armor set from Naxxramas.
Undying Aesthetic is a 10-point achievement earned by collecting any complete Tier 7 class armor set from the Wrath of the Lich King version of Naxxramas.
Identify Your Token Group
Tier 7 tokens are split into three groups — Conqueror (Paladin, Priest, Warlock), Protector (Warrior, Hunter, Shaman), and Vanquisher (Rogue, Death Knight, Mage, Druid) — and are not available for Monks or Demon Hunters. The 10-man set (iLvl 200) is labeled Heroes' and the 25-man set (iLvl 213) is labeled Valorous.
Farm the Token Bosses
Enter Naxxramas and defeat the following bosses for their corresponding tokens: 
Helm tokens drop from Kel'Thuzad, 
Glove tokens drop from Sartharion, and 
Leg tokens drop from Thaddius. Chest and shoulder token sources were not specified in available data, so farm all bosses across resets to complete the set.
Turn In Tokens in Dalaran
Travel to the Northrend version of Dalaran and turn in your tokens at the vendor matching your armor type — for example, plate wearers visit the Blacksmithing shop and cloth wearers visit Threads of Fate. As of patch 7.2, tokens can also be clicked directly to create the item based on your loot specialization without visiting a vendor.
Purchase Missing Tokens With Gold
Some tokens can be purchased from Horde or Alliance vendors in Dalaran using gold — for example, Legplates of the Lost Vanquisher can be bought from Magister Brasael in Dalaran, then exchanged at Valerie Langrom, also in Dalaran, for the corresponding tier legs.
Check Auction House for BOE Pieces
Certain non-token slot items, such as Slime Stream Bands (bracers), are bind-on-equip and can be purchased from the Auction House if you are missing them.
Tips
Buying tokens from vendors or the Auction House may not trigger the achievement — at least one player confirmed the achievement only fired after a token dropped in-raid and was used, not after purchasing the final piece through Dalaran vendors.