This will more than likely be the last trophy / achievement that you’ll unlock as you need to complete the game fully twice (ng,ng+) then start (ng++) up until the boss Sif, collecting along the way – boss souls, cutting the tails off of certain bosses/enemies, joining certain covenants, killing certain enemies and looting chests/corpses throughout the entire game, taking you through the hardest areas in the game, navigating traps and dealing with some of the optional bosses multiple times on your way to your trophy
In total there are 50 rare weapons to collect
Please Note ~ to ensure you can unlock this trophy as efficiently as possible NEVER consume a boss soul, as once done the game will autosave and you’ll lose the soul (cloud saves help here but then you lose the souls gained anyway)
You will also need a lot of weapons to make the majority of the rare weapons, once you have the required items listed below, you need to take them to the Giant Blacksmith in Anor Londo. There you will be able to craft the rare weapon
You won’t need to equip or upgrade any of these rare weapons, simply having them in your inventory will suffice, however, don’t ever sell/drop a rare weapon until your trophy / achievement has unlocked to avoid any potential issues
Here is a list of the boss souls and how many times you’ll need that particular soul, meaning you’ll need to defeat the boss and acquire its’ soul over multiple playthroughs (ng, ng+, ng++)etc