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