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