Almost Flying

This requires you to parachute from the Galata Tower to the water in the harbor.

Your best bet is to pull out your parachute as soon as possible. Waiting a while after jumping from the tower will cause you to land just shy of the water. Also you need to land in the water to get the Achievement/Trophy.

The easiest and best way to land in the water is next to a dock straight ahead of the tower's perch (to find the tower, its the largest structure in the town. refer to your location database to find it) the dock is L shaped and you should land in the water next to it (make sure the water is directly connected to the open sea)

Galata tower is near the very top of the map (north) and is easily located by looking for the only landmark across the water.