Here is the full list of all 88 Nioh 2 – The Complete Edition achievements. It takes around 100-120 hours to unlock all of the achievements on Windows.
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Completed "Against All Comers" on Dream of the Demon or higher.
Completed picture scroll missions 10 times.
Attained 100% Penitence on a Stone of Penance.
Defeated Tsuchigumo while equipped with at least one piece of gear with the special effect "Dragon Ninja".
Obtained the aid of Tokichiro, Minamoto no Yoshitsune, and Minamoto no Yorimitsu from a Benevolent Grave in "A Familiar Glow".
Completed "The Dragon's Kin".
Completed "The Alluring Ancient".
Completed "A Distant Dream".
Collected all Kodama in "The First Samurai".
Defeated the four demons in "A Distant Dream".
Saved all the Mujina in "A Distant Dream".
Bathed in every hot spring found in "The First Samurai".
Collected all of Kukai's brushes in "Words of Respite".
Remodeled a piece of equipment.
Performed a Soul Match.
Fused any Soul Core until it reached rank 9.
Acquired mystic art for the fists.
Completed "Dawn of the Demon".
Used a cask of holy water in "Dawn of the Demon" to damage an enemy's Ki.
Acquired mystic art for the splitstaff.
Acquired mystic art for the switchglaive.
Acquired mystic art for the hatchets.
Completed "Palace of the Damned".
Collected all Kodama in "Darkness in the Capital".
Lit all fire altars in "Palace of the Damned".
Bathed in every hot spring found in "Darkness in the Capital".
Became Ryunojo the Dung Lover's best friend and received the Coiled Snake Helmet smithing text.
Collected all Kodama.
Caused Oboroguruma to release Amrita from its carriage at least 10 times.
Acquired mystic art for the tonfa.
Acquired mystic art for the odachi.
Completed "The Blighted Gate".
Completed "Suzune in the Flames".
Obtained all Soul Cores.
Appraised your tea utensils 50 times.
Used the Brute, Feral, and Phantom Burst Counters five times each to counter a Burst Attack.
Defeated the boss of "The Viper's Sanctum" without breaking the statue of Shirohami.
Acquired mystic art for the kusarigama.
Acquired mystic art for the axe.
Completed "Eternal Rivals".
Used an attack to knock Yoshitsune off his perch on the bridge in "Eternal Rivals".
Collected all Kodama in "The Tengu's Disciple".
Collected all of Saigyo's poetry cards.
Bathed in every hot spring found in "The Tengu's Disciple".
Destroyed 150 of the golden Amrita shards found in the gold mine in "Eternal Rivals".
Acquired mystic art for the spear.
Completed "Shadows Creep in Kurama".
Acquired mystic art for the dual swords.
Collected all Guardian Spirits.
Completed "A Song to Calm the Storm".
Obtained a Kodama's Soul Core.
Used all the giant bows in "A Song to Calm the Storm".
Displayed a calligraphy scroll in your hut.
Completed your first Twilight mission.
Saw Tokichiro off on his final departure.
Defeated all types of yokai.
Dispelled every instance of the Dark Realm in the main missions.
Acquired mystic art for Ninjutsu.
Fulfilled your ultimate destiny.
Bathed in every hot spring.
Defeated each of the Seven Spears in "Cherry Blossom Viewing in Daigo".
Summoned an Acolyte from a Benevolent Grave 10 times.
Acquired mystic art for Onmyo Magic.
Reunited with your mother in the Interim.
Destroyed every Amrita shard in "The High-spirited Demon".
Reached level 100.
Defeated Tokichiro.
Acquired mystic art for the sword.
Rang all the bells in "Ruin Draws Near".
Parted ways with Tokichiro.
Encountered all the Usura-Hicho in "The Frenzied Blaze".
Completed 10 missions with NPCs or as Expeditions with other users. (Does not include Acolytes.)
Got Gyuki to attack the dam in "Pervading Waters".
Drove back every Tatarimokke along the journey in "A Way Out".
Decided to share a name with Tokichiro.
Discovered 10 hidden items on the map.
Used the Kodama Bazaar.
Forged an item.
Defeated Imagawa Yoshimoto and was made a samurai.
Listened to the innermost thoughts of a Yokai Weapon.
Bathed in first hot spring.
Exchanged gifts with a Sudama for the first time.
Reached level 10.
Befriended Tokichiro.
Defeated Mezuki and Gozuki in the same mission.
Obtained your first Soul Core.
Defeated Gozuki in "The Village of Cursed Blossoms".