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Drop Dead, Gorgeous
Collect any class armor set from Naxxramas.
Drop Dead, Gorgeous is a Feat of Strength requiring you to collect any complete Tier 3 class armor set originally from Naxxramas, obtainable through the Black Market Auction House or the in-game crafting system introduced in a later patch.
Choose Your Tier 3 Set
Select one of the nine original Naxxramas class sets to pursue: Dreadnaught's Battlegear (Warrior), Redemption Armour (Paladin), The Earthshatterer (Shaman), Cryptstalker Armour (Hunter), Bonescythe Armour (Rogue), Dreamwalker Raiment (Druid), Plagueheart Raiment (Warlock), Vestments of Faith (Priest), or Frostfire Regalia (Mage). Tier 7 pieces from the level 80 version of Naxxramas do not count toward this achievement.
Check for Lookalike Pieces
Exact visual lookalikes that share the same model and color scheme as a Tier 3 piece count toward the achievement criteria. For example, 
Lurker's Girdle from old Karazhan is identical in appearance to Redemption Girdle and can substitute for it, potentially saving a significant amount of gold compared to acquiring the original from the Black Market Auction House.
Acquire Pieces via BMAH or Crafting
Individual Tier 3 pieces can be won from the Black Market Auction House. Alternatively, unlock the crafting system by completing the Ancient Secrets within Naxxramas to access the NPC Zackett Skullsmash, then farm Corruptor's Scourgestones from Naxxramas bosses to exchange for Death's Bargaining Chips, which are used to buy Dented Gear Tokens from Zackett Skullsmash. The crafting route also requires Phylacterweave.
Collect Pieces Account-Wide
Tier 3 pieces can be spread across multiple characters on your account and still count toward the achievement collectively. If you purchase a piece on a low-level character, opening the mailbox adds the item to your collection without needing to level that character. The ring slot is not required to complete the set for this achievement.
Tips
Pieces collected across your entire account all count toward the same set, so you do not need every item on a single character.