Here is the full list of all 55 Onimusha: Warlords achievements.
Complete the game and get an S Rank.
Unlock Kaede's alternate outfit.
Complete the game in less than 3 hours.
Complete the game on Ultimate difficulty.
Complete all stages of Oni Spirits.
Obtain the Bishamon Sword.
NEW_ACHIEVEMENUse Magic Jewels to increase Magic Power to maximum._DESC_2_7
Use Power Jewels to increase Vitality to maximum.
Enhance the gauntlet to maximum.
Complete the game on Normal without enhancing swords or using Jewels.
Unlock Samanosuke's alternate outfit.
Complete the game on Normal without using herbs or medicine.
Defeat Fortinbras.
Collect all maps.
Defeat Marcellus's final form.
Enhance all swords to maximum.
Strike Marcellus's final form with a Deflect Critical attack.
Open the gate to the Demon World.
Complete the second half of the Dark Realm.
Collect all Fluorite.
Complete the first half of the Dark Realm.
Defeat Hecuba.
Solve all number puzzles.
Collect all files.
Solve all decoder boxes.
Obtain all armor for Samanosuke.
Defeat a demon by knocking it down the waterfall.
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.
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.
Enhance all orbs to maximum.
Win a power struggle with a demon.
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.
Obtain the Shiden.
Find the beetle on the tree trunk.
Use a Special Attack to kill a demon.
Spot the flock of wild geese at dusk.
Use the gauntlet to absorb demon souls.