Armory

Every armour type obtained - the console-era mega-collection spanning wood to endgame, including each mechanical-tier set's three helmet variants. In practice it's a crafting audit of the whole game: keep one of every set you pass through rather than shredding it, then work down a checklist for the exotic ones (fishing, event and drop-based sets included). One of the longest console unlocks; a wiki checklist and a big storage room are the right toolkit.