achievementsguild-wars-2
The Urban Battlefield Fractal in Guild Wars 2 has an ancillary achievement: Slay All the Chickens in the city. Because Kitties hate chickens, I assume.
But I'm going to be a little distracted dodging arrows, burning oil, ballista bolts, and who knows what else. Where are all the chickens hiding?
This sounds a lot like the Mysterious Relics deed, but there's only 5 mysterious relics (linked page has detailed maps to each one):
Mysterious Relics is a deed gained from finding each of the five mysterious relics, gaining the delivery quest from each one, and completing them. The reward is the title, "The Calm Before the Storm". While you're tagging the relics, you might want to go tag the related instances as well, as explained on the In Their Absence page.
Each one also corresponds to a different Gaunt Lord, in the related deed In Their Absence, although the two deeds are not otherwise related.
This thread explains it all pretty well.
Three levels were updated with snow - Normal 1, Bonus 1, and Extended 6. Each of these have two hidden switches.
Here are the locations of the switches for Normal 1:
Switch 1
Switch 2
Here are the switch locations for Bonus 1:
Switch 1
Switch 2
Here are the switch locations for Extended 6:
Switch 1
Switch 2
Finally, this video shows you where to find them all if the pictures were not clear.
Best Answer
I'm going off of memory when I got the achievement, but there should be five or six chickens.
There were two in the area you start in (courtyard), three within the city, and one in the final area where you fight the boss. I believe the chicken spawns are somewhat random so it may or may not help. What tripped me up was the achievement description which spoke of chickens being in the city...when there are chickens outside of the city walls.