Here is the full list of all 55 Onimusha: Warlords achievements.
Spot the flock of wild geese at dusk.
Find the beetle on the tree trunk.
Strike Marcellus's final form with a Deflect Critical attack.
Absorb souls from carp.
Complete the game on Normal without using herbs or medicine.
Complete the game on Normal without enhancing swords or using Jewels.
Complete the game and get an S Rank.
Unlock Kaede's alternate outfit.
NEW_ACHIEVEMENUse Magic Jewels to increase Magic Power to maximum._DESC_2_7
Complete the game on Ultimate difficulty.
Complete all stages of Oni Spirits.
Collect all files.
Complete the game in less than 3 hours.
Collect all Fluorite.
Strike a demon with Kaede's Special Attack.
Win a power struggle with a demon.
Unlock Samanosuke's alternate outfit.
Defeat Fortinbras.
Obtain the Bishamon Sword.
Collect all maps.
Defeat Marcellus's final form.
Open the gate to the Demon World.
Defeat a demon by knocking it down the waterfall.
Defeat Hecuba.
Solve all number puzzles.
Solve all decoder boxes.
Obtain all armor for Samanosuke.
Use Power Jewels to increase Vitality to maximum.
Use the Decorated Sword to enter the East Area.
Obtain all long-range weapons.
Enhance all swords to maximum.
Enhance the gauntlet to maximum.
Complete the second half of the Dark Realm.
Complete the first half of the Dark Realm.
Defeat Barabazuu.
Kill a demon with a battering ram.
Enhance all orbs to maximum.
Obtain the Vision Staff.
Defeat Stylado.
Obtain the Sacred Knife.
Speak to the first and second old moth man.
Cut down bamboo in the bamboo forest.
Obtain the Rosary of Communication.
Unseal the path to the Keep Underground.
Obtain the Arashi.
Defeat Marcellus.
Solve the crest puzzle.
Enter the abandoned keep.
Obtain the Kouen.
Defeat Osric.
Save a soldier under attack by demons.
Use a Special Attack to kill a demon.
Enhance equipment at Magic Mirror.
Obtain the Shiden.
Use the gauntlet to absorb demon souls.