Help Mantled with Might achievement

[Chef Big Dog]

(Im on new game+ btw)
Ive got every set of armour in the game including all of the bull kings armour. When i look on the craft armour page I've got everything made but when I go into my inventory the only armour set that's not there is the Galeguard BeastMaw chest piece and I think its stopping me from getting the achievement entirely. I'm really not sure what to do would really appreciate some help.