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 Brewmaster (achievement).

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

The quest reward is a Wolpertinger's Tankard which can be used to spawn a wolpertinger companion.