To get it you must upgrade every weapon posible with solafite to do it u must build a Solafite Upgrader. To build a Solafite Upgrader, you must first discover blueprint, located in a cavern just south-west of the Golf Course. When u will make it get 6 solafite and put it inside, get in your main hand an weapon that you want to upgrade and put it inside Upgrader. Upgraded weapons deal more damage.
WARNING When it will upgrade your weapons mutants will spawn so be vigilant.
Okay so this is how you upgrade weapons but now back to topic so to get it you must upgrade this items
-Axe
-Crafted Club
-Cross
-Firefighter Axe
-Guitar
-Katana
-Machete
-Modern Axe
-Pickaxe
-Pistol
-Putter
-Revolver
-Rifle
-Shotgun
After it you will automt automatically get the achievement.
Thats all TYY for reading pookie <3