Viva Piñata

Create a custom label for your Piñatas. Just press X and go to the top right corner of the menu. There you can create a custom label for you garden and earn your achievement.

For this achievement you just need to create a custom label for your piñatas, to do this press and hold "X" while in your garden, choose the option in the top right corner of this menu, in here you'll be able to customise the label you currently use, you don't have to make much of an alteration, just change one thing and save it, the achievement will unlock.

You can also use the option to random/auto-generate a new label to get the achievement.

Press then go to the ? mark symbol [top corner] and then customize [however you want] and then when you're happy with it, submit
Then the achievement will pop!