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Stable Keeper
Obtain 10 mounts (usable by a single character).
Stable Keeper is a 10-point achievement earned by obtaining 10 mounts usable by a single character, and a quick way to complete it is purchasing inexpensive faction mounts at exalted reputation.
Buy Faction Mounts at Exalted
At exalted reputation, level 30 mounts cost only 
8 gold each from faction vendors. Purchasing mounts from three different factions gives you enough to reach 10 total, and any mount added to your mount tab counts toward the achievement.
Count Your Existing Mounts
If you already have a 100% land mount and a flying mount, you may only need to buy a few additional mounts to reach 10, potentially spending as little as 64 gold total on the remaining faction mounts needed.
Note Per-Character Counting
The achievement counts mounts separately for each character, so class-specific mounts (such as those for Warlocks, Death Knights, or Paladins) count toward that character's total and can help reach 10 more easily on those classes.