So if your reading you should know that this can be achieved by defeating X'tabay. After she's defeated and she gives you the power to change dimensions go to your house in Agave. Go to the right and drop down switch your form and become the chicken then switch dimensions looking for an opening. You will only have a second to move before it makes you go back to the living world. Once in the opening follow to a statue that has orb. Bam achievement will pop for a cool 30 gamerscore.