#4 - Oct. 3, 2010, 12:13 a.m.
Unfortunately, any item that provides an Achievement, once purchased, is unable to be refunded. This is intended at this time.
I do apologize for any inconvenience, but if you feel that this is a policy that should change, you are most welcome to post your feedback in the Suggestion Forums, where those with the power to make such changes can review your request. >^.^<