I've gotten every single gift so far (Without buying any). I obviously know how to get them, right?
All nine gifts.
This was previously a complete 2013 Egg Hunt Guide.
Achievements of the Populace Gift: http://www.roblox.com/Forum/ShowPost.aspx?PostID=119657662
Festive Gift of Impossibility:
This contains how to get all of the current gifts; all new ones will be added in updates.
This guide will be updated when more information/more gifts are given out.
NOTE: You do not receive the gifts directly after earning them, they are handed out 1-3 days after they were released.
Shutdown means updates.