Requirement
Defeat the final bosses of the level 26-45 dungeon group.
Detail
Dungeons: City of Dalaran; Gnomeregan; Scarlet Monastery: Graveyard; Scarlet Monastery: Armory; Razorfen Kraul; Blackfathom Deeps; The Drowned City; Scarlet Monastery: Library; Scarlet Monastery: Cathedral; Krol'dok Stronghold.
Dungeons
City of Dalaran; Gnomeregan; Scarlet Monastery: Graveyard; Scarlet Monastery: Armory; Razorfen Kraul; Blackfathom Deeps; The Drowned City; Scarlet Monastery: Library; Scarlet Monastery: Cathedral; Krol'dok Stronghold
Notes
Blizzard's article does not list the dungeons; the list is Wowhead's reading of the client challenge text.
Confidence note
Challenge and points: Blizzard's article. The client's challenge name, dungeon list: Reported (one outlet).