Mission 9: The Hunted
Once you gain control of the character, you goal is to complete the level without being spotted and shot at. If you are spotted, you can remain in stealth if you kill them before they shoot or inform other guards. During the first section you want to make your way through the forest by crouching and avoiding enemies which can be seen on your handheld radar. Feel free to kill any enemies via headshot or melee if you are close to them and they are alone. You will then meet up with your team where you will rescue some allies. From here on out, it is very important to listen to their instructions and follow them. Hide in the waterfall, crouch through the tall grass, prone to hide from the chopper and then finish the level without any alerts to get the achievement.