To get the chicken suit simply complete the puppet show on the Fable II website ( http://fable2.xbox.com
), and choose the "good" crown (the one in the middle) at the end of the show. Enter your gamertag information, log on to Xbox Live, load up Fable II, and then collect the prize in the Guild Hall (in the treasure chest next to the Cullis gate).
When you get to the colosseum, you will need to kick a total of 5 chickens (the kick the chicken bonus). This is total, which means if you kick 3 in one battle and then 2 in another battle, then you will unlock the achievement.
1) If you complete the puppet show two more times and select the other two crowns, then you can obtain all three available prizes.
2) You can also get help by using two threads available on this site, which are linked below:
Fable II Dollcatcher Forum:Fable II - Dollcatcher
Fable 2 Doll Trading Forum:Fable 2 - Doll Trading
*** UPDATES ***:
1) Provided via Mithodor NB:
They have closed the puppet show site for getting the prizes. However, you can register here and get the chicken suit, lion tattoos, a dye, and the generic hero doll. It worked for me.http://lionhead.com/fable/fableii/experience.aspx
2) If you had already unlocked the chicken suit from the site, and subsequently lost it, it got stolen by a friend :), or you started a new game, then you should be able to buy the chicken suit from most clothing sellers (as a reiteration, you can ONLY buy the suit from clothing sellers if you have previously unlocked the suit via the website).