Here is the full list of all 38 Demon's Souls (JP) trophies - there are 27 bronze, 5 silver, 5 gold and 1 platinum.
All Trophies Obtained
All Magic Learned
Obtained Best Weapon by Cloudstone
Obtained Best Weapon by Pulpstone
Obtained Best Weapon by Bladestone
All Valuable Weapons Obtained
Obtained Best Weapon by Greystone
Obtained Best Weapon by Mercurystone
Obtained Best Weapon by Darkmoonstone
All Rings Obtained
Conqueror of Old King Doran
Obtained Best Weapon by Clearstone
Old Beast Put to Sleep & World United
Slayer of Demon “False King”
Obtained Best Weapon by Faintstone
Obtained Best Weapon by Moonlightstone
Obtained Best Bow by Spiderstone
Obtained Best Weapon by Splinterstone
Obtained Best Weapon by Sharpstone
Slayer of Demon “Flying Dragon”
Slayer of Demon “Penetrator”
Slayer of Demon “Tower Knight”
Obtained Best Weapon by Dragonstone
Obtained Best Weapon by Suckerstone
All Miracles Learned
Slayer of Demon “Maiden Astraea”
Slayer of Demon “Dirty Colossus”
Slayer of Demon “Leechmonger”
Slayer of Demon “Old Monk”
Slayer of Demon “Maneater”
Slayer of Demon “Storm King”
Slayer of Demon “Old Hero”
Slayer of Demon “Fool's Idol”
Slayer of Demon “Adjucator”
Slayer of Demon “Dragon God”
Slayer of Demon “Flamelurker”
Slayer of Demon “Armor Spider”
Slayer of Demon “Phalanx”