I have seen, that Tricks and Treat of Pandaria doesn't contain the right description. The achievement says in the description:
"Visit the Candy Buckets in Kalimdor".
I think it should be saying:
"Visit the Candy Buckets in Pandaria".
Then you read a little longer in the description all the areas is Pandaria areas such as, Jade Forest and Kun-Lai Summit.
Those areas are Pandaria areas, which can be checked if you open up your map in-game, zooms out and click on Pandaria in the bottom.