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.
Attained 100% Penitence on a Stone of Penance.
Completed "The Dragon's Kin".
Defeated Tokichiro.
Rang all the bells in "Ruin Draws Near".
Collected all Kodama.
Appraised your tea utensils 50 times.
Bathed in every hot spring.
Remodeled a piece of equipment.
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.
Bathed in every hot spring found in "Darkness in the Capital".
Obtained the aid of Tokichiro, Minamoto no Yoshitsune, and Minamoto no Yorimitsu from a Benevolent Grave in "A Familiar Glow".
Completed "The Alluring Ancient".
Summoned an Acolyte from a Benevolent Grave 10 times.
Completed "A Distant Dream".
Collected all Kodama in "The First Samurai".
Defeated the four demons in "A Distant Dream".
Bathed in every hot spring found in "The First Samurai".
Saved all the Mujina in "A Distant Dream".
Collected all of Kukai's brushes in "Words of Respite".
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.
Acquired mystic art for the tonfa.
Acquired mystic art for the fists.
Acquired mystic art for the splitstaff.
Defeated the boss of "The Viper's Sanctum" without breaking the statue of Shirohami.
Acquired mystic art for Ninjutsu.
Completed "Palace of the Damned".
Collected all Kodama in "Darkness in the Capital".
Lit all fire altars in "Palace of the Damned".
Acquired mystic art for the switchglaive.
Acquired mystic art for the hatchets.
Acquired mystic art for the kusarigama.
Completed "The Blighted Gate".
Completed "Suzune in the Flames".
Completed your first Twilight mission.
Got Gyuki to attack the dam in "Pervading Waters".
Collected all Guardian Spirits.
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".
Performed a Soul Match.
Acquired mystic art for the axe.
Acquired mystic art for the dual swords.
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 sword.
Saw Tokichiro off on his final departure.
Defeated all types of yokai.
Acquired mystic art for the odachi.
Fulfilled your ultimate destiny.
Acquired mystic art for the spear.
Defeated each of the Seven Spears in "Cherry Blossom Viewing in Daigo".
Reached level 100.
Acquired mystic art for Onmyo Magic.
Reunited with your mother in the Interim.
Destroyed every Amrita shard in "The High-spirited Demon".
Completed 10 missions with NPCs or as Expeditions with other users. (Does not include Acolytes.)
Parted ways with Tokichiro.
Encountered all the Usura-Hicho in "The Frenzied Blaze".
Discovered 10 hidden items on the map.
Used the Brute, Feral, and Phantom Burst Counters five times each to counter a Burst Attack.
Decided to share a name with Tokichiro.
Obtained a Kodama's Soul Core.
Forged an item.
Listened to the innermost thoughts of a Yokai Weapon.
Used the Kodama Bazaar.
Defeated Imagawa Yoshimoto and was made a samurai.
Fused any Soul Core until it reached rank 9.
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".
You have unlocked all achievements!
Obtained all Soul Cores.
Drove back every Tatarimokke along the journey in "A Way Out".
Completed picture scroll missions 10 times.
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.