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