WoW Achievement Guide
Achievements were added into WoW with the Wrath of the Lich King (WoTLK) expansion pack. Players can earn Achievements in WoW by completing a number of different tasks. Easy things like looting gold and leveling up will reward you with an achievement as well as other miscellaneous things such as eating a bunch of different food or collecting a certain number of mounts. Not all achievements are mundane and easy though, some take a bit of difficulty to get such as raid achievements that require you to go out of your way and perform above and beyond normal standards.
Acquiring an achievement in WoW rewards players with Achievement Points. Achievement Points have absolutely no use aside from pure bragging rights if you get a lot of them. Blizzard has said they do not know if they will ever add a use for Achievement Points but I can't think of what they could possibly add. Even though every achievement gives you points (aside from the Feats of Strength Achievements); there are some special Achievements that give you additional rewards.
For example, the collecting 100 mount achievement gives you an Albino Drake that you can ride around on. Completing the more difficult Raid Achievements gives you a unique mount you can use as well. Other Achievements such as the Vanity Pet Achievement will give you a unique Vanity Pet the more Vanity Pets you collect. Little things like this are rewarded for collecting certain achievements. Anyway, I think you've probably heard enough about them for now, below you can find my guides for every achievement in the game. Good luck and happy hunting!
General Achievement Guide
Player Vs Player
Dungeon & Raid Achievements
World Event Achievements
Feats of Strength Achievement Guides