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Winter Catalog
Collect any class armor set from Icecrown Citadel.
Winter Catalog is earned by collecting any complete Tier 10 class armor set from Icecrown Citadel, which consists of five pieces available in three item level versions obtained through gold purchases and upgrade tokens.
Identify Your Class Tokens
Tier 10 upgrade tokens are split by class group: Paladins, Priests, and Warlocks use the 
Conqueror's Mark of Sanctification; Warriors, Hunters, and Shaman use the Protector's Mark of Sanctification; Rogues, Mages, Druids, and Death Knights use the Vanquisher's Mark of Sanctification. Note that Monks and Demon Hunters have no Tier 10 set and cannot earn this achievement.
Purchase the Base ilvl 251 Set
The base ilvl 251 five-piece set is purchased with gold from vendors. Cloth class vendors are located in Dalaran (Northrend), for example Rueben Lauren sells all cloth class set items there. Each class also has a dedicated vendor inside Icecrown Citadel — for example, Malfus Grimfrost (Alliance) or Uvlus Banefire (Horde) sell Mage set items inside the raid. Additionally, Toravon the Ice Watcher in Vault of Archavon drops ilvl 251 glove and leg items on 10-player mode.
Upgrade to ilvl 264 and 277
To upgrade a base ilvl 251 piece to ilvl 264, obtain the appropriate class-based Mark of Sanctification token — these drop from bosses in Icecrown Citadel on 10-player Heroic and 25-player Normal difficulty — then turn in the token alongside the existing piece to the vendor. The ilvl 277 version follows the same process using the next tier of tokens, which drop in 25-player Heroic difficulty.
Note the Hunter Exception
If playing a Hunter, collecting all five pieces of the Tier 10 set alone does not complete this achievement. Blizzard additionally requires two specific items from Icecrown Citadel: Scourge Hunter's Vambraces and Treads of the Wasteland. Enter Icecrown Citadel and defeat the relevant bosses until both items drop.
Tips
The Sets interface tracks your progress split across 10-Player Normal, 25-Player Normal, and 25-Player Heroic difficulties, so collecting any one full set of five pieces across any single difficulty tier satisfies the achievement.
25-Player Normal difficulty Armor Tokens also drop in 10-Player Heroic difficulty, giving you an additional weekly lockout to farm upgrade tokens.