This achievement will most likely be rewarded to you through natural progression! Performing a critical shot is quite straightforward. It was my primary mode of attack during my playthrough to get easy damage in, so just know that this will probably come without much trouble.
Aiming in:
Performing a ranged attack:
Simply aim for the head when performing a ranged attack and you will perform a critical shot should you hit them in the head. You'll know you performed a critical shot if the damage indicator is displayed as gold instead of white.
You can go and find some larger and tougher enemies to get multiple critical shots in one barrage of attacks! As long as you are using critical shots as you play the game, you'll get this achievement no problem and you will also get the achievement for 10 critical shots on your way to this achievement:
Here is my video guide for Sharpshooter for those who may prefer a verbal / visual explanation:
Hope this guide helped! Please let me know if I missed anything or got anything wrong! Constructive criticism is always welcome.
