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