Mission 7 The Hornet's Nest
Near the end of the mission, you will fight through a market filled with caged chickens. At the end of the market is three clusters of cages, close to one another. Simply begin shooting the chickens (grenades don't seem to count) for the achievement / trophy. reload the checkpoint as needed.
Here is a video guide with English commentary!
Here is a playlist of guides for this game!https://www.youtube.com/playlist?list=PL-HeW6XkKdUK97oYVSMU7...