The Loremaster

The Loremaster is a meta-achievement that rewards the player with a title and tabard after they have completed a high number of quests in each continent of the game. Daily quests do not count toward this achievement; some other repeatable quests only count the first time they're completed.

The title obtained from this achievement precedes the character's name, in the following format:
 * Loremaster 

Letters from the leaders
The — the other reward from this achievement — comes in the mail attached to a letter. For the Alliance, they will receive their letter from Tyrande Whisperwind.

For the Horde, they will receive their letter from Cairne Bloodhoof.

With Cairne's death prior to the Cataclysm, it is yet to be seen who will appoint new Loremasters of the Horde in the future...

The Numbers
The numbers for Alliance and Horde are different in all respects. In order to complete the achievements, the player must complete a set number of quests in each zone. Before Cataclysm, in the pre-expansion areas (Kalimdor and the Eastern Kingdoms), players had to complete a total number of quests across the entire continent, regardless of zone.

With the addition of the quests from 80 to 85, the title "the Seeker" (obtained from ) can be obtained before completing the Loremaster, as each faction now has over 3,000 quests to complete.

The Alliance
The Alliance requires a grand total of 3,443 quests to obtain this achievement, separated by continent:
 * with 648 quests total.
 * 18 in Arathi Highlands
 * 35 in Badlands
 * 35 in Blasted Lands
 * 40 in Burning Steppes
 * 60 in Cape of Stranglethorn
 * 45 in Duskwood
 * 70 in Eastern Plaguelands
 * 30 in Hinterlands
 * 45 in Loch Modan
 * 50 in Northern Stranglethorn
 * 40 in Redridge Mountains
 * 35 in Searing Gorge
 * 25 in Swamp of Sorrows
 * 45 in Western Plaguelands
 * 35 in Westfall
 * 40 in Wetlands
 * with 724 quests total.
 * 70 in Ashenvale
 * 65 in Bloodmyst Isle
 * 90 in Darkshore
 * 60 in Dustwallow Marsh
 * 55 in Felwood
 * 40 in Feralas
 * 19 in Silithus
 * 60 in Stonetalon Mountains
 * 50 in Southern Barrens
 * 40 in Tanaris
 * 60 in Thousand Needles
 * 55 in Un'Goro Crater
 * 60 in Winterspring
 * with 568 quests total.
 * 80 in Hellfire Peninsula
 * 54 in Zangarmarsh
 * 63 in Terokkar Forest
 * 75 in Nagrand
 * 86 in Blade's Edge Mountains
 * 120 in Netherstorm
 * 90 in Shadowmoon Valley
 * with 875 quests total.
 * 130 in Borean Tundra
 * 130 in Howling Fjord
 * 115 in Dragonblight
 * 85 in Grizzly Hills
 * 100 in Zul'Drak
 * 75 in Sholazar Basin
 * 100 in Storm Peaks
 * 140 in Icecrown
 * with 628 quests total.
 * 160 in Vashj'ir
 * 115 in Mount Hyjal
 * 125 in Deepholm
 * 108 in Uldum
 * 120 in Twilight Highlands

The Horde
The Horde requires a grand total of 3,370 quests to obtain this achievement, separated by continent:
 * with 603 quests total.
 * 18 in Arathi Highlands
 * 35 in Badlands
 * 35 in Blasted Lands
 * 40 in Burning Steppes
 * 60 in Cape of Stranglethorn
 * 70 in Eastern Plaguelands
 * 50 in Ghostlands
 * 50 in Hillsbrad Foothills
 * 30 in Hinterlands
 * 50 in Northern Stranglethorn
 * 35 in Searing Gorge
 * 60 in Silverpine Forest
 * 25 in Swamp of Sorrows
 * 45 in Western Plaguelands
 * with 704 quests total.
 * 80 in Ashenvale
 * 100 in Azshara
 * 50 in Dustwallow Marsh
 * 55 in Felwood
 * 45 in Feralas
 * 70 in Northern Barrens
 * 19 in Silithus
 * 40 in Stonetalon Mountains
 * 40 in Southern Barrens
 * 40 in Tanaris
 * 60 in Thousand Needles
 * 45 in Un'Goro Crater
 * 60 in Winterspring
 * with 595 quests total.
 * 90 in Hellfire Peninsula
 * 54 in Zangarmarsh
 * 68 in Terokkar Forest
 * 87 in Nagrand
 * 86 in Blade's Edge Mountains
 * 120 in Netherstorm
 * 90 in Shadowmoon Valley
 * with 875 quests total.
 * 150 in Borean Tundra
 * 105 in Howling Fjord
 * 130 in Dragonblight
 * 75 in Grizzly Hills
 * 100 in Zul'Drak
 * 75 in Sholazar Basin
 * 100 in Storm Peaks
 * 140 in Icecrown
 * with 593 quests total.
 * 150 in Vashj'ir
 * 115 in Mount Hyjal
 * 125 in Deepholm
 * 108 in Uldum
 * 95 in Twilight Highlands

Loremaster in Cataclysm
With the changes brought by the Shattering the Loremaster meta-achievement also changed. New achievement – was added, and both  and  changed to meta-achievements similar to those from Outland and Northrend, and contain specific zone loremasters quests.

Tips and Tricks

 * When doing the Old world parts, pick a starting zone, such as Elwynn Forest or Durotar, and go to the starting area (e.g. Northshire Abbey) and start doing quests. Don't jump from area to area at random. Sometimes, there are long running quest chains that start in the lowest areas that go through several zones; follow these through to completion.
 * Complete quest chains even if the zone under which the quest categorized is not a zone for which you are working toward the achievement. Often, the chain leads back to the zone you want, or the quest counts for the zone you'd like regardless of how it is listed in your log. For instance, a quest listed under "The Hinterlands" in your quest log may actually count toward Loremaster of Kalimdor, rather than Eastern Kingdoms. It also may lead to other quests back in Kalimdor even if it doesn't.
 * Repeatable or daily quests in general can be assumed not to count towards any Loremaster though there are a few exceptions. If they do at all, it is likely that only the first completion (which is sometimes technically a separate quest and not repeatable or daily, as in the case of Not a Bug) will count. They will on occasion count towards The Seeker.
 * Try to find all of the quests for a particular dungeon before doing it.
 * Since patch 3.3.0 addons can acquire a list of all quests that a player has already completed. This helps a lot to identify missing quests for a zone (especially in the Eastern Kingdoms and Kalimdor). One of those addons that make use of this new API is EveryQuest.
 * Use the addon EveryQuest together with LoreMaster and possibly EveryQuest-Questgivers for a most efficient way to achieve the Loremaster achievement.
 * Additionally, WoWhead.com offers players similar functionality if one uploads a character profile to the website.