The zodiac set consists of 12 figurines that stand for each different year of the Chinese zodiac (I believe). You would have to TT 12 years to get all the pieces. Fortunately, some people did just that, and have the entire set (like me, and the poster before me).
It's not technically released, but it is obtainable. :)
Animal Crossing New Leaf: Tomochi, Town: Mist FC: 386681798786