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.
Acquired mystic art for the switchglaive.
Completed "Against All Comers" on Dream of the Demon or higher.
Used the Brute, Feral, and Phantom Burst Counters five times each to counter a Burst Attack.
Caused Oboroguruma to release Amrita from its carriage at least 10 times.
Acquired mystic art for the spear.
Used an attack to knock Yoshitsune off his perch on the bridge in "Eternal Rivals".
Completed picture scroll missions 10 times.
Acquired mystic art for the axe.
Acquired mystic art for the sword.
Acquired mystic art for the dual swords.
Forged an item.
Collected all Guardian Spirits.
Completed "The Alluring Ancient".
Remodeled a piece of equipment.
Became Ryunojo the Dung Lover's best friend and received the Coiled Snake Helmet smithing text.
Attained 100% Penitence on a Stone of Penance.
Summoned an Acolyte from a Benevolent Grave 10 times.
Defeated the boss of "The Viper's Sanctum" without breaking the statue of Shirohami.
Used the Kodama Bazaar.
Completed "The Dragon's Kin".
Collected all Kodama.
Acquired mystic art for the kusarigama.
Collected all of Kukai's brushes in "Words of Respite".
Collected all Kodama in "The First Samurai".
Bathed in every hot spring found in "The First Samurai".
Completed "A Distant Dream".
Defeated the four demons in "A Distant Dream".
Saved all the Mujina in "A Distant Dream".
Displayed a calligraphy scroll in your hut.
Completed "Dawn of the Demon".
Used a cask of holy water in "Dawn of the Demon" to damage an enemy's Ki.
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".
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".
Completed "Shadows Creep in Kurama".
Acquired mystic art for Onmyo Magic.
Acquired mystic art for Ninjutsu.
Completed "A Song to Calm the Storm".
Used all the giant bows in "A Song to Calm the Storm".
Obtained all Soul Cores.
Saw Tokichiro off on his final departure.
Defeated all types of yokai.
Dispelled every instance of the Dark Realm in the main missions.
Fulfilled your ultimate destiny.
Bathed in every hot spring.
Defeated each of the Seven Spears in "Cherry Blossom Viewing in Daigo".
Performed a Soul Match.
Acquired mystic art for the fists.
Reunited with your mother in the Interim.
Destroyed every Amrita shard in "The High-spirited Demon".
Reached level 100.
Defeated Tokichiro.
Rang all the bells in "Ruin Draws Near".
Parted ways with Tokichiro.
Encountered all the Usura-Hicho in "The Frenzied Blaze".
Fused any Soul Core until it reached rank 9.
Got Gyuki to attack the dam in "Pervading Waters".
Listened to the innermost thoughts of a Yokai Weapon.
Drove back every Tatarimokke along the journey in "A Way Out".
Discovered 10 hidden items on the map.
Decided to share a name with Tokichiro.
Defeated Imagawa Yoshimoto and was made a samurai.
Completed 10 missions with NPCs or as Expeditions with other users. (Does not include Acolytes.)
Completed your first Twilight mission.
Obtained a Kodama's Soul Core.
Exchanged gifts with a Sudama for the first time.
Bathed in first hot spring.
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".
You have unlocked all achievements!
Acquired mystic art for the odachi.
Acquired mystic art for the tonfa.
Acquired mystic art for the hatchets.
Acquired mystic art for the splitstaff.
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".