Does Your Wolpertinger Linger?

Does Your Wolpertinger Linger? is related to the seasonal event Brewfest. Completing this achievement is also an objective of the meta achievement.

Locations
On US servers, you can complete the quest or  to satisfy this achievement. On EU servers during the 2009 festival the quest has been removed, but the can be bought from Belbi Quikswitch (Alliance) or Blix Fixwidget (Horde) for 50s.

The quest reward is a which can be used to spawn a wolpertinger companion.