20 transmog appearances in Naxxramas.
Agonal SashCloth Waist
Arachnoid Gold BandMail Wrist
Boots of PersistenceMail Feet
Chivalric ChestguardPlate Chest
Corpse Scarab HandguardsMail Hands
DawnwalkersLeather Feet
Gemmed Wand of the NerubiansRanged
Gloves of Dark GesturesCloth Hands
Inexorable SabatonsPlate Feet
Knife of IncisionOne-Hand
Leggings of AtrophyCloth Legs
Mantle of the LocustsCloth Shoulder
Pauldrons of Unnatural DeathPlate ShoulderRavaging SabatonsPlate Feet
Rescinding GripsPlate Hands
Sabatons of Sudden ReprisalPlate FeetSash of the ParlorCloth Waist
Shield of AssimilationShield
Splint-Bound LeggingsLeather Legs
Swarm BindingsLeather Wrist
Webbed DeathOne-HandSign in with Battle.net to see which of these appearances and collectibles you already have, and which of your characters can still loot Anub'Rekhan this reset.