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The Ultimate Collection
Obtain all of the legendary items listed below.
The Ultimate Collection requires obtaining all legendary items listed in the achievement, including Sulfuras, Thunderfury, and others obtainable by farming their respective classic and Burning Crusade raids solo at max level.
Farm Molten Core for Sulfuras
Enter Molten Core and defeat Baron Geddon and Garr repeatedly until you obtain the 
Eye of Sulfuras. Collect 
Sulfuron Ingots from your runs and have a blacksmith craft the 
Sulfuron Hammer, then combine it with the Eye of Sulfuras to complete Sulfuras, Hand of Ragnaros. The item counts toward the guild achievement the moment it lands in your inventory — you do not need to equip it.
Farm Bindings for Thunderfury
Continue running Molten Core solo and defeat Baron Geddon and Garr until both Bindings of the Windseeker drop, then follow the crafting chain to complete 
Thunderfury, Blessed Blade of the Windseeker.
Obtain Remaining Legendaries
Farm the appropriate raids for 
Val'anyr, Hammer of Ancient Kings via 
Fragments of Val'anyr, 
Shadowmourne via 
Shadowfrost Shards, 
Thori'dal, the Stars' Fury, and 
Warglaive of Azzinoth from their respective raids, all soloable at max level. The legendary cloak is no longer obtainable.
Tips
Any guild member who is honored with the guild and has a qualifying legendary in their inventory — not just equipped — will trigger progress toward this achievement.