Anyone who needs to know where to find the save game for Atlas I found it.
D:\Steam\steamapps\common\ATLAS\ShooterGame then inside you save found. Pretty much all steam games saves will be in D:\Steam\steamapps\common\ . You then just select you game and search for saved folder inside it. Only difference for people is the drive. I have steam installed on my D drive . If you have yours on another drive it will be (Your Drive Letter):\Steam\steamapps\common\ATLAS\ShooterGame