Here is the full list of all 79 Nioh: Complete Edition achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
You have unlocked all achievements!
Completed the 20th plane in The Abyss.
Equipped the Kusanagi Tsurugi, Yasakani Magatama, and Yata Mirror.
Completed "The Grand Tournament" on Way of the Strong or higher.
Equipped +15 divine equipment in all slots. (Excludes accessories.)
Completed "The Master Ninja" on Way of the Strong or higher.
Made a total of 60 requests at the blacksmith.
Completed any mission while transformed into a woman.
Collected all Kodama in the "Siege of Osaka (Summer)" chapter.
Defeated the Onmoraki during "Resentment Unleashed."
Bathed in every hot spring in the "Siege of Osaka (Summer)" chapter.
Completed "The Last Samurai."
Collected all Guardian Spirits.
Defeated all types of yokai.
Destroyed all the Revenant contraptions on "The Last Samurai."
Completed "Resentment Unleashed."
Completed "The Sanada's Resolve."
Destroyed all the destructible cannons in "The Sanada's Resolve."
Defeated Ganryu's Sasaki Kojiro using only Dual Wooden Swords. (Cannot use a Visitor/Companion.)
Completed "The Sparrow Flies Again."
Collected all Kodama in the "Siege of Osaka (Winter)" chapter.
Bathed in every hot spring in the "Siege of Osaka (Winter)" chapter.
Completed "Scion of Virtue."
Defeated all of Sanada's Ten Braves in "Scion of Virtue."
Completed "Hands of the Dragon."
Completed the mission "The Siege of Osaka (Winter)."
Defeated Sarutobi Sasuke in the mission "The Siege of Osaka (Winter)" using only tonfa. (Cannot use a Visitor/Companion.)
Used all the culverins in the mission "The Siege of Osaka (Winter)."
Collected all Kodama in the Tohoku region.
Bathed in every hot spring in the Tohoku region.
Completed "Spirit Stone Huntress."
Completed "The One-Eyed Dragon's Castle."
Listened to Katakura Shigenaga's entire introduction in "The One-Eyed Dragon's Castle."
Seized all of Aoba Castle's three-storied keeps in "The One-Eyed Dragon's Castle."
Collected all Kodama from the Kyushu Region to the Omi Region.
Collected all the best materials.
Completed "Yokai Country."
Acquired 40 gestures.
Became Ryunoshin the dung lover's best friend.
Made two circuits around Japan.
Completed "The Queen's Eyes."
Defeated Derrick the Executioner.
Bathed in every hot spring from the Kyushu Region to the Omi Region.
Completed "The Demon King Revealed."
Obtained first divine item.
Acquired mystic art for the tonfa.
Collected all fragments of the Hiragumo teakettle from Shigisan.
Completed "The Samurai from Sawayama."
Acquired mystic art for Onmyo Magic.
Reached level 100.
Acquired mystic art for Ninjutsu.
Acquired mystic art for the axe.
Acquired mystic art for the spear.
Completed "The Source of Evil."
Acquired mystic art for the odachi.
Acquired mystic art for the dual swords.
Acquired mystic art for the kusarigama.
Acquired mystic art for the sword.
Witnessed Tokugawa's forces head toward a decisive battle.
Met with Tokugawa Ieyasu.
Found Muramasa and brought him in.
Completed 10 missions with NPC or in the “Yokai Realm with a companion” with other users.
Used a disguise.
Reached maximum proficiency with your first weapon.
Changed your hair style or beard.
Completed "The Demon of Mount Hiei."
Defeated the Nue of Mount Hiei.
Completed "The Ocean Roars Again."
Lit all three evil-warding bonfires in Itsukushima.
Used the mask of an ugly fellow to defeat an enemy.
Completed your first Twilight mission.
Communicated with a yokai 10 times.
Confused an enemy for the first time.
Changed the appearance of an item.
Forged an item.
Completed "Deep in the Shadows."
Bathed in first hot spring.
Reached level 10.
Completed "The Man with the Guardian Spirit".