This is my own guide that I made recently for this achievement.
You need to cover your HANDS, FEET, CHEST, and HEAD for the cheevo (you don't need a weapon). These can be any of the items from the treasure trove. To get to the treasure trove, hold B and choose the very bottom option on the wheel.
Please watch the video as I show you exactly how to do this achievement! If you have any questions, please leave a comment and let me know if there is anything I can do to improve my solution, thanks!