To unlock this trophy you must have purple weapons and gear equipped to each available slot in your loadout menu. Please note that while yellow gear is of a higher rarity than purple gear, it must be purple gear equipped to meet the requirements. You can occasionally buy purple gear from the shop, however as you're progressing through the game you will come across plenty of it from enemy drops and from loot crates scattered around the majority of locations in the game. Once you have three purple weapons (two primary weapons and one handgun), and five pieces of purple gear (headwear, handwear, vest, pants and footwear) equip them all and this trophy will unlock.