Tom Clancy's Splinter Cell HD

You’ll get this within the 2 playthroughs if you disable all the turret guns you find. The first is in CIA Headquarters. Simply go up to the rectangular box by the side of it and select the disable option and then exit. You’ll know it has worked when the turret stops rotating and stops trying to kill you. There are plenty in the Abattoir level if you need to grind this at the end of the game.