And wanting more. 42 books to find (Knowledge is the meaning of life?) in various places around the world.
You could, of course go and find each book individually. But that wouldn't be very efficient use of your time. Most books have multiple (2-3) spawn points so as alliance or horde you may have to enter some houses controlled by the other faction and risk getting killed.
I've marked the books on this list with all currently known spawn locations, some are only available in dungeons, conveniently marked with a (d). While some spawn in either Alliance (a) or Horde (h) territory.
Horde quick path
You won't want to go and grab those books from A-Z, so based on that list, you would be able to visit the book "hotspots" and get most of them done pretty quickly. There's only one that may be tricky to get, as it's in a raid dungeon, or alliance territory.
Let's start in Dalaran, find the one book there then take a portal to orgrimmar and head into durotar.
Grab the book in the old alliance fort then head back to Orgrimmar and take a flightpath to Thunder Bluff.
Head down and to the west where the alliance dig is, find the books among the others there and get to the nearest flightpath to Tanaris.
There's also three books at the Gadget Inn but these are duplicates of others you'll get later. So skip those. The book you need can be found inside the caverns of time at the east side of the zone. The book is inside the first door to your right nead a NPC called Alexton Chrom. After tanaris you'll need to fly to Ratchet.
The next two are in Ratchet. One in the Inn, the other inside the Engineer shop. After you got them, head south for the fortress.
You'll find the books in the first tower. One on a table right as you enter, the second on the top floor right in front of the stairs. Head back to Ratchet and get on the boat afterwards.
Find the books here, one in the Salty sailor tavern.
Three in the basement of "Sea Wolf" MacKinley.
And one in the room above him.
Next go to Grom'gol for a bipedal field trip to westfall.
To westfall, ignore the npcs and guards as much as possible and grab the book that is located in the inn. It's the building with the mailbox in the front. Head back to Grom'gol and take the zeppelin to Undercity.
From Undercity you can take the portal to Silvermoon and get the following two books. The first is on the second floor or the Wayfarer's rest Inn, the second inside Velaani's Arcane Goods store.
Afterwards you take the same portal back to Undercity.
Northeast out of Undercity you'll find Scarlet Monastery. An interesting thing to note, is that you can read books while in stealth and remain in stealth.
Head into the library (portal without a door on the right) then head past the couryard and on to the right. You'll find a red carpeted hall with some alcoves. This is the Gallery of treasures where you'll find the first book next to two scarlet diviners and a monk. And the next one in the alcove after that.
The next book is in the next hallway on the left, with the other book on the right side.
One room further, another two books. The world tree on the right and Arathor on the left.
The next curved room, one book directly right of you as you enter, one book in front of you on the table, and the next two tables.
And the last room where Arcanist Doan roams around, from left to right:
Once you got the books here head for scholomance and you'll be nearly done.
The last few, you're almost there.
Mind that I'm specifically going back here for your benefit and to make finding these books easier for you! I'm sure you'd have a hard time finding them otherwise. If you're not a stealth class, this should still be piss at level 80. But just in case you can always bring a friend along.
Straight forward then trough the door and down the stairs you'll find a table.
Then going counter clockwise across the tables and wall.
On to the next room, past the spiders and summoners and then directly on a table to your right.
At the back end of this same room another three.
Now, you'll need to go past the drake whelps and kill Rattlegore for the key, then head back and down to the room with all the skeletons and ghouls. Here you'll find another two books.
The last book is "just" past the viewing room door. So yeah you needed that key. It is located on the right side justs behind Marduk.
The higher learning achievement awards you with the way to teleport up to the violet citadel spires. There's a guy there who will give you this cool pet elemental to summon. Be warned though, this achievement may look easy (only 8 books), but it is not for the faint of heart.
The goal is to read the following 8 books:
The books are a direct reference to magic used in the lands of Baldur's gate, Never Winter Nights etc. Also known as the Forgotten Realms.
Or rather, tested speculations which proved to be fairly accurate.
If you're actively farming for this achievement it's recommended to team up with other players, or create a public channel where you can share locations. Some common channels used for this goal are:
* Bookclub / Book club
* Higherlearning / Higher Learning
Simply type "/join bookclub" to join such a channel. Be sure to set the channel color to something that's very noticeable or you may miss it when there's a book spotted! Since the books have a 3-4 hour spawn time, you should be able to get frequent updates on real or dud books with more players using the channel.