27 transmog appearances in Naxxramas.
Aged Winter CloakCloth Back
Bindings of the DecrepitMail Wrist
Breastplate of Tormented RagePlate Chest
Chestguard of Bitter CharmsPlate Chest
Cloak of Averted CrisisCloth BackCloak of the Shadowed SunCloth Back
Cryptfiend's BiteTwo-Hand
Cuffs of Dark ShadowsLeather Wrist
DemiseTwo-Hand
Eruption-Scarred BootsMail Feet
Gloves of the Dancing BearLeather Hands
Heigan's Putrid VestmentsCloth Chest
Helm of PilgrimageMail Head
Iron-Spring JumpersPlate Feet
Leggings of Colossal StridesMail Legs
Legguards of the ApostlePlate Legs
Necrogenic BeltMail WaistPreceptor's BindingsCloth Wrist
Saltarello ShoesCloth FeetSerene EchoesCloth Feet
Shawl of the Old MaidCloth Back
Shoulderplates of BloodshedPlate ShoulderShroud of LuminosityCloth Back
Staff of the Plague BeastTwo-HandStalk-Skin BeltLeather Waist
The Undeath CarrierTwo-Hand
Tunic of the Lost PackMail ChestSign in with Battle.net to see which of these appearances and collectibles you already have, and which of your characters can still loot Heigan the Unclean this reset.