Viva Piñata

Same as the Piñatas. Once you hire a Helper, put your cursor on it and press the Y button to view statistics. There you will be able to press A to name it.

To name a helper you must first highlight them with your cursor and then press the "Y" button, this will bring up the information concerning that particular helper, while in that menu use the D-pad to select the "information" tab and then press "A", this will allow you to rename the helper, once you've named the helper and finished doing so the achievement will unlock!