To get this achievement you need to get an item to max level, you increase the level of an item through use. I got this achievement by leveling an item up to level 3, which is the max level when you start the game, eventually you can get the items to level 5, but that's only after you get a certain item for story progression
I found the tank's shield easy to level up, just hit
to block damage, I leveled most of mine quickly by maxing the Glancer skill, then going to level 1-5: The Royal Gardens. There's a place in the level where two sets of turrets fire across the path, I stood between the turrets and pressed
to activate the skill just before I got hit.