https://forum.psnprofiles.com/topic/94051-armed-to-the-teeth...Hardest three to get:
Ancient King's Mace - Defeat the staggered Lava Monster with a bare-fisted throw
Josephine's Parasol - In the final boss fight of Aku City, knock out Zeke, then defeat the staggered Josephine with a bare-fisted throw
Great Samurai Warrior's Sword - Destroy all the red crystals both above and below in the first area of Aku's Mines and open the chest that it triggers, or open a chest that can only be accessed by using explosive arrows on at least two consecutive doors in a secret area of Cave of the Ancient