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!
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.
Equipped the Kusanagi Tsurugi, Yasakani Magatama, and Yata Mirror.
Equipped +15 divine equipment in all slots. (Excludes accessories.)
Defeated Ganryu's Sasaki Kojiro using only Dual Wooden Swords. (Cannot use a Visitor/Companion.)
Completed "Hands of the Dragon."
Collected all the best materials.
Completed "The Sparrow Flies Again."
Collected all Guardian Spirits.
Bathed in every hot spring in the "Siege of Osaka (Summer)" chapter.
Defeated the Onmoraki during "Resentment Unleashed."
Completed "Spirit Stone Huntress."
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."
Completed "Resentment Unleashed."
Completed "The Sanada's Resolve."
Destroyed all the destructible cannons in "The Sanada's Resolve."
Bathed in every hot spring in the "Siege of Osaka (Winter)" chapter.
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."
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."
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)."
Completed any mission while transformed into a woman.
Used all the culverins in the mission "The Siege of Osaka (Winter)."
Used a disguise.
Became Ryunoshin the dung lover's best friend.
Completed 10 missions with NPC or in the “Yokai Realm with a companion” with other users.
Confused an enemy for the first time.
Changed your hair style or beard.
Forged an item.
Made two circuits around Japan.
Completed "The Queen's Eyes."
Defeated Derrick the Executioner.
Acquired mystic art for Onmyo Magic.
Collected all Kodama from the Kyushu Region to the Omi Region.
Acquired 40 gestures.
Completed "The Demon King Revealed."
Obtained first divine item.
Bathed in every hot spring from the Kyushu Region to the Omi Region.
Acquired mystic art for Ninjutsu.
Acquired mystic art for the tonfa.
Completed "The Samurai from Sawayama."
Acquired mystic art for the kusarigama.
Acquired mystic art for the axe.
Changed the appearance of an item.
Acquired mystic art for the spear.
Completed "The Source of Evil."
Reached level 100.
Acquired mystic art for the dual swords.
Acquired mystic art for the sword.
Acquired mystic art for the odachi.
Witnessed Tokugawa's forces head toward a decisive battle.
Communicated with a yokai 10 times.
Completed your first Twilight mission.
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.
Collected all fragments of the Hiragumo teakettle from Shigisan.
Completed "The Ocean Roars Again."
Lit all three evil-warding bonfires in Itsukushima.
Completed "Deep in the Shadows."
Used the mask of an ugly fellow to defeat an enemy.
Bathed in first hot spring.
Reached level 10.
Completed "The Man with the Guardian Spirit".