Image: Sucker Punch Productions / PlayStationOfficial screenshot from Sucker Punch Productions / PlayStation.
The Perfect Storm is the trophy for fully upgrading your sword. You upgrade the Sakai Katana at any swordsmith with supplies, iron, steel and gold.
Visit a swordsmith whenever you have the materials and buy the next upgrade. Steel comes from places like minor territories. Gold comes from major territories.
Liberate major Mongol territories for gold, since the last two upgrades need it.
Image: Sucker Punch Productions / PlayStationA Charming Man
Equip a charm in all 6 slots.
Image: Sucker Punch Productions / PlayStationEvery Trick in the Book
Unlock every throwable Ghost Weapon.
Image: Sucker Punch Productions / PlayStationQuick Study
Learn the Stone, Water, Wind and Moon stances.
Image: Sucker Punch Productions / PlayStationThe Benefit of All Beings
Raise your Iki Island Legend to the title Legacy Redeemer.