Here is the full list of all 55 Onimusha: Warlords achievements.
Complete the game on Normal without enhancing swords or using Jewels.
Complete the game on Normal without using herbs or medicine.
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.
NEW_ACHIEVEMENUse Magic Jewels to increase Magic Power to maximum._DESC_2_7
Find the beetle on the tree trunk.
Spot the flock of wild geese at dusk.
Complete all stages of Oni Spirits.
Unlock Samanosuke's alternate outfit.
Defeat Fortinbras.
Obtain the Bishamon Sword.
Collect all maps.
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.
Collect all Fluorite.
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 Power Jewels to increase Vitality to maximum.
Use the Decorated Sword to enter the East Area.
Complete the second half of the Dark Realm.
Complete the first half of the Dark Realm.
Enhance the gauntlet to maximum.
Obtain all long-range weapons.
Defeat Barabazuu.
Kill a demon with a battering ram.
Cut down bamboo in the bamboo forest.
Obtain the Vision Staff.
Defeat Stylado.
Obtain the Sacred Knife.
Speak to the first and second old moth man.
Strike a demon with Kaede's Special Attack.
Enhance all orbs to maximum.
Enhance all swords to maximum.
Win a power struggle with a demon.
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.