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 picture scroll missions 10 times.
Acquired mystic art for the tonfa.
Used the Brute, Feral, and Phantom Burst Counters five times each to counter a Burst Attack.
Completed "Against All Comers" on Dream of the Demon or higher.
Acquired mystic art for the odachi.
Acquired mystic art for the kusarigama.
Acquired mystic art for the axe.
Acquired mystic art for the splitstaff.
Acquired mystic art for the spear.
Acquired mystic art for the hatchets.
Used the Kodama Bazaar.
Acquired mystic art for the switchglaive.
Acquired mystic art for the sword.
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".
Used an attack to knock Yoshitsune off his perch on the bridge in "Eternal Rivals".
Bathed in every hot spring found in "The Tengu's Disciple".
Rang all the bells in "Ruin Draws Near".
Encountered all the Usura-Hicho in "The Frenzied Blaze".
Defeated the boss of "The Viper's Sanctum" without breaking the statue of Shirohami.
Collected all Guardian Spirits.
Acquired mystic art for the dual swords.
Caused Oboroguruma to release Amrita from its carriage at least 10 times.
Obtained the aid of Tokichiro, Minamoto no Yoshitsune, and Minamoto no Yorimitsu from a Benevolent Grave in "A Familiar Glow".
Completed "The Alluring Ancient".
Obtained all Soul Cores.
Remodeled a piece of equipment.
Obtained a Kodama's Soul Core.
Acquired mystic art for Ninjutsu.
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.
Completed "The Dragon's Kin".
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".
Appraised your tea utensils 50 times.
Completed "The Blighted Gate".
Completed "Suzune in the Flames".
Displayed a calligraphy scroll in your hut.
Completed "Eternal Rivals".
Collected all Kodama in "The Tengu's Disciple".
Collected all of Saigyo's poetry cards.
Destroyed 150 of the golden Amrita shards found in the gold mine in "Eternal Rivals".
Completed "Shadows Creep in Kurama".
Acquired mystic art for Onmyo Magic.
Bathed in every hot spring.
Collected all Kodama.
Became Ryunojo the Dung Lover's best friend and received the Coiled Snake Helmet smithing text.
Dispelled every instance of the Dark Realm in the main missions.
Completed "A Song to Calm the Storm".
Used all the giant bows in "A Song to Calm the Storm".
Saw Tokichiro off on his final departure.
Defeated all types of yokai.
Fulfilled your ultimate destiny.
Defeated each of the Seven Spears in "Cherry Blossom Viewing in Daigo".
Reunited with your mother in the Interim.
Reached level 100.
Destroyed every Amrita shard in "The High-spirited Demon".
Acquired mystic art for the fists.
Defeated Tokichiro.
Parted ways with Tokichiro.
Got Gyuki to attack the dam in "Pervading Waters".
Discovered 10 hidden items on the map.
Listened to the innermost thoughts of a Yokai Weapon.
Completed your first Twilight mission.
Summoned an Acolyte from a Benevolent Grave 10 times.
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.
Fused any Soul Core until it reached rank 9.
Forged an item.
Performed a Soul Match.
Defeated Imagawa Yoshimoto and was made a samurai.
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".