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