Fresh Goblin Brewfest Hops

Fresh Goblin Brewfest Hops provides a buff which converts your mount into a Great Brewfest Kodo mount, normally associated with the Horde. Only available to the Alliance. Duration: 1 hour.

Source
Fresh Goblin Brewfest Hops is purchased from the Brewfest Token vendors and  for a cost of  These are only available to the Alliance, and are only available during Brewfest; the Brewfest Tokens required to purchase them disappear when Brewfest ends.

Use
Using a Fresh Goblin Brewfest Hops puts a buff on your character which converts your mount into a Great Brewfest Kodo. The buff is on you, not on the mount; if you switch mounts, the buff is still active. The duration of the buff is one hour.

Achievement
Use of this item satisfies the achievement if you have riding training. You do not have to have a mount, nor use a mount, nor have a mount actually converted; the achievement procs as soon as you use the hops. This item is a cheap way to easily proc this achievement.