Sniper: Ghost Warrior 2
37 Achievements
20-25h
Kill With Still
Kill 50 enemies while holding your breath
37.2%
How to unlock the Kill With Still achievement in Sniper: Ghost Warrior 2 - Definitive Guide
Holding your breath is done by pushing and holding . On all difficulties but expert it slows down time, and it reduces scope sway on every difficulty. The majority, if not all, of your kills should be done while holding your breath as you should take any advantage you can when trying to kill the enemies. There is no way to track this number, but since there are an abundance of enemies in every mission you will more than likely earn this on your first playthrough.
This will come with natural progression. Continue playing through the campaign and when you are zoomed in, hold down the . You will hold your breath and have a control over your shot.
To check your progress and kills, from the main menu select extras and personal stats.