This is a secret... Perhaps, one must find the hidden chicken on the map and stand on that particular tile for a certain number of rounds? That might be the only hint that I can give you on this occasion...
I thought you had to paint your left knee green, hold your right foot with your left hand and your nose with your right, while whistling your national anthem underwater.
Oh, sorry, getting it confused with the 'Letters From Nowhere' quest.
My two-cents is that 'chicken' usually means to run away from something - usually a fight. As there seem to be some 'negative' achievements, maybe this is one and you have to begin an Adventure and then leave before you have a chance to do anything at all?...It's a thought. :whistle: