Here is the full list of all 56 Onimusha: Warlords trophies - there are 48 bronze, 5 silver, 2 gold and 1 platinum.
Collect all trophies.
Complete the game on Ultimate difficulty.
Complete all stages of Oni Spirits.
Strike a demon with Kaede's Special Attack.
Strike Marcellus's final form with a Deflect Critical attack.
Complete the game on Normal without using herbs or medicine.
Complete the game on Normal without enhancing swords or using Jewels.
Collect all Fluorite.
Win a power struggle with a demon.
Collect all files.
Defeat a demon by knocking it down the waterfall.
Absorb souls from carp.
Cut down bamboo in the bamboo forest.
Spot the flock of wild geese at dusk.
Find the beetle on the tree trunk.
Use Magic Jewels to increase Magic Power to maximum.
Use Power Jewels to increase Vitality to maximum.
Kill a demon with a battering ram.
Unlock Samanosuke's alternate outfit.
Obtain the Bishamon Sword.
Complete the second half of the Dark Realm.
Complete the first half of the Dark Realm.
Solve all decoder boxes.
Unlock Kaede's alternate outfit.
Complete the game and get an S Rank.
Complete the game in less than 3 hours.
Defeat Fortinbras.
Enhance all swords to maximum.
Enhance the gauntlet to maximum.
Collect all maps.
Defeat Marcellus's final form.
Open the gate to the Demon World.
Defeat Hecuba.
Solve all number puzzles.
Obtain all armor for Samanosuke.
Enhance all orbs to maximum.
Use the Decorated Sword to enter the East Area.
Obtain all long-range weapons.
Defeat Barabazuu.
Obtain the Vision Staff.
Speak to the first and second old moth man.
Defeat Stylado.
Obtain the Sacred Knife.
Obtain the Rosary of Communication.
Unseal the path to the Keep Underground.
Obtain the Arashi.
Defeat Marcellus.
Solve the crest puzzle.
Enhance equipment at Magic Mirror.
Enter the abandoned keep.
Obtain the Kouen.
Defeat Osric.
Save a soldier under attack by demons.
Use a Special Attack to kill a demon.
Obtain the Shiden.
Use the gauntlet to absorb demon souls.