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 Grand Tournament" on Way of the Strong or higher.
Completed the 20th plane in The Abyss.
Equipped +15 divine equipment in all slots. (Excludes accessories.)
Collected all the best materials.
Equipped the Kusanagi Tsurugi, Yasakani Magatama, and Yata Mirror.
Completed "The Master Ninja" on Way of the Strong or higher.
Completed "The Sparrow Flies Again."
Collected all Guardian Spirits.
Bathed in every hot spring in the "Siege of Osaka (Summer)" chapter.
Completed "The Last Samurai."
Defeated all types of yokai.
Destroyed all the Revenant contraptions on "The Last Samurai."
Collected all Kodama in the "Siege of Osaka (Summer)" chapter.
Defeated the Onmoraki during "Resentment Unleashed."
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 any mission while transformed into a woman.
Used a disguise.
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)."
Communicated with a yokai 10 times.
Completed 10 missions with NPC or in the “Yokai Realm with a companion” with other users.
Completed "Hands of the Dragon."
Made a total of 60 requests at the blacksmith.
Acquired mystic art for the tonfa.
Completed "Spirit Stone Huntress."
Collected all Kodama in the Tohoku region.
Bathed in every hot spring in the Tohoku region.
Listened to Katakura Shigenaga's entire introduction in "The One-Eyed Dragon's Castle."
Acquired mystic art for the axe.
Acquired 40 gestures.
Completed "The One-Eyed Dragon's Castle."
Seized all of Aoba Castle's three-storied keeps in "The One-Eyed Dragon's Castle."
Bathed in every hot spring from the Kyushu Region to the Omi Region.
Defeated the Nue of Mount Hiei.
Acquired mystic art for the dual swords.
Used the mask of an ugly fellow to defeat an enemy.
Completed "Yokai Country."
Made two circuits around Japan.
Completed "The Queen's Eyes."
Defeated Derrick the Executioner.
Acquired mystic art for the sword.
Completed "The Demon King Revealed."
Obtained first divine item.
Collected all Kodama from the Kyushu Region to the Omi Region.
Acquired mystic art for Onmyo Magic.
Completed "The Samurai from Sawayama."
Acquired mystic art for the spear.
Acquired mystic art for Ninjutsu.
Reached level 100.
Completed "The Source of Evil."
Reached maximum proficiency with your first weapon.
Acquired mystic art for the odachi.
Acquired mystic art for the kusarigama.
Witnessed Tokugawa's forces head toward a decisive battle.
Became Ryunoshin the dung lover's best friend.
Met with Tokugawa Ieyasu.
Found Muramasa and brought him in.
Completed your first Twilight mission.
Completed "The Demon of Mount Hiei."
Collected all fragments of the Hiragumo teakettle from Shigisan.
Completed "The Ocean Roars Again."
Lit all three evil-warding bonfires in Itsukushima.
Confused an enemy for the first time.
Changed your hair style or beard.
Completed "Deep in the Shadows."
Bathed in first hot spring.
Forged an item.
Changed the appearance of an item.
Reached level 10.
Completed "The Man with the Guardian Spirit".