Sniper (Metro 2033 Achievement/trophy)

Sniper is an achievement in Metro 2033 and Metro 2033 Redux, awarded for killing certain amount of enemies with headshots.

Overview
This achievement is awarded for getting 25 headshots in Metro 2033, and 30 in Metro 2033 Redux. These must be on human enemies. This can only be completed through the use of firearms - throwing knives do not count. This achievement is easiest to complete on Ranger Mode Easy as most human enemies will go down from a single shot to the head from a VSV and it will not alert enemies to your location.