Mountain o' Mounts

Mountain o' Mounts is a general achievement added in patch 3.0.8. The criteria is to obtain 100 different mounts. The reward is a dragonhawk flying mount.

Reward
Depending on your character's faction you get either the Blue Dragonhawk Mount or the Red Dragonhawk Mount, respectively for the Alliance and the Horde.

Series
Mountain o' Mounts is the final achievement of a series from the same kind.

Mail
You receive the mount in the mail, along with the following message: