Shoot the Flying Pigeon for a 1.20 point modifier.
This Challenge vies for the most difficult in the game, it is really a question of this or the headshot Challenge really – basically what you need to do is shoot the five pigeons from the previous pigeon-related challenge and then the one that starts flying from left to right in the rear upper area of the scene.
Watch the video if you need help on spotting the locations watch the video embedded below: