I have obtained all artifact weapons for my class and received the “Arsenal of Power” achievement.
However, I am unable to buy the belt piece from the class quartermaster Kelsey Steelspark for the “A Classy Outfit” achieve - the belt requires the “Arsenal of Power” achievement.
GM told me to submit this as a bug, after grinding the rest of the pieces and hitting this bug - any chance of fixing this? Or just send me the belt 
Best, Stripout