Beware the Neggbreaker View all Avatars

Have participated in the Negg Journey Plot. You didn't need to have completed all steps. The avatar is rewarded by clicking on Mysterious Negg at the Festival of Neggs 2012 page. You receive the avatar after choosing your final prize.

or

If you didn't get this avatar during the Negg Journey plot, you have a chance to get it random when solving the Mysterious Negg Cave puzzle, which can be tried once a day.
(You need to actually click the 'Continue' button after solving the puzzle or the avatar will not be awarded.)