How do you get the achievement fly like an eagle in assassins creed brotherhood?

To get the "Fly Like an Eagle" achievement in Assassin's Creed Brotherhood, you need to use the flying machine to glide for a certain distance without touching the ground. First, complete the relevant mission to unlock the flying machine, then find a high point to launch yourself. Glide for at least 1,000 meters while maintaining altitude. Make sure to steer carefully and avoid obstacles to achieve this distance successfully.