This can be attained after completing "Location 1 - Ninjago City North" and gaining access to the freeplay area of the stage.
The first Side Quest is located across the river from your starting position and requires you to find the golden chicken hidden in 1 of 5 locations.
To make this easier activate the "Master of Detection" ancient scroll:
This will create blue arrow markers to show you where the chickens are on the stage.