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