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.
Used an attack to knock Yoshitsune off his perch on the bridge in "Eternal Rivals".
Completed picture scroll missions 10 times.
Obtained all Soul Cores.
Acquired mystic art for the fists.
Acquired mystic art for the kusarigama.
Acquired mystic art for the axe.
Acquired mystic art for the hatchets.
Acquired mystic art for the spear.
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".
Saved all the Mujina in "A Distant Dream".
Defeated the four demons in "A Distant Dream".
Bathed in every hot spring found in "The First Samurai".
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".
Completed "The Blighted Gate".
Completed "Suzune in the Flames".
Acquired mystic art for the splitstaff.
Acquired mystic art for Onmyo Magic.
Acquired mystic art for Ninjutsu.
Completed "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".
Appraised your tea utensils 50 times.
Acquired mystic art for the tonfa.
Completed "Shadows Creep in Kurama".
Acquired mystic art for the sword.
Remodeled a piece of equipment.
Completed "A Song to Calm the Storm".
Used all the giant bows in "A Song to Calm the Storm".
Acquired mystic art for the dual swords.
Got Gyuki to attack the dam in "Pervading Waters".
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.
Defeated Gozuki in "The Village of Cursed Blossoms".
Displayed a calligraphy scroll in your hut.
Summoned an Acolyte from a Benevolent Grave 10 times.
Obtained a Kodama's Soul Core.
Saw Tokichiro off on his final departure.
Defeated all types of yokai.
Dispelled every instance of the Dark Realm in the main missions.
Bathed in every hot spring.
Acquired mystic art for the switchglaive.
Collected all Guardian Spirits.
Fulfilled your ultimate destiny.
Collected all Kodama.
Defeated each of the Seven Spears in "Cherry Blossom Viewing in Daigo".
Became Ryunojo the Dung Lover's best friend and received the Coiled Snake Helmet smithing text.
Reunited with your mother in the Interim.
Destroyed every Amrita shard in "The High-spirited Demon".
Defeated Tokichiro.
Reached level 100.
Acquired mystic art for the odachi.
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.)
Discovered 10 hidden items on the map.
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.
Completed your first Twilight mission.
Used the Kodama Bazaar.
Performed a Soul Match.
Defeated Imagawa Yoshimoto and was made a samurai.
Fused any Soul Core until it reached rank 9.
Listened to the innermost thoughts of a Yokai Weapon.
Forged an item.
Bathed in first hot spring.
Exchanged gifts with a Sudama for the first time.
Reached level 10.
Befriended Tokichiro.
Obtained your first Soul Core.
You have unlocked all achievements!
Defeated Tsuchigumo while equipped with at least one piece of gear with the special effect "Dragon Ninja".
Caused Oboroguruma to release Amrita from its carriage at least 10 times.
Completed "Against All Comers" on Dream of the Demon or higher.
Collected all of Kukai's brushes in "Words of Respite".