Mission 6: Emerald Base - Insertion:
Early in the mission you will reach a bridge that's need to be activated.
When you reach this bridge you have to go back a bit and enter a bunker.
In this bunker you will have to kill around +/- 5 enemies and activate a switch.
After activating this switch a FULLY ARMORED ENEMY
will enter the bunker, it's just this one enemy and no other enemies will be around.
The trick here is to shoot the enemy by single taps and not by full spraying, I used an assault rifle. 1)
First shoot his body armor (Dark green looking) and after like 30-45 shots the armor will be destroyed, when his armor is destroyed he will still be wearing a beige colour looking vest, that's completely fine and stop shooting the body
Next thing is to shoot the helmet, this will take like 15-30 shots.3)
When both the body armor and the helmet are destroyed/disappeared you instantly press the
-button to go in melee-mode, than you just finish off the enemy by punching him like 3-5 times.4)
The achievement should pop instantly.
It's recommended to do this achievement on the easiest difficulty, when starting up this mission the achievement can be obtained in only 5-10 minutes, very easy to do.
Also, this game has mission select, so you can always go back and do it later if you have to.