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.
Defeated Mezuki and Gozuki in the same mission.
Defeated Gozuki in "The Village of Cursed Blossoms".
Performed a Soul Match.
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!
Reached level 100.
Defeated Imagawa Yoshimoto and was made a samurai.
Decided to share a name with Tokichiro.
Parted ways with Tokichiro.
Defeated Tokichiro.
Reunited with your mother in the Interim.
Fulfilled your ultimate destiny.
Saw Tokichiro off on his final departure.
Listened to the innermost thoughts of a Yokai Weapon.
Acquired mystic art for the sword.
Acquired mystic art for the dual swords.
Acquired mystic art for the spear.
Acquired mystic art for the axe.
Acquired mystic art for the kusarigama.
Acquired mystic art for the odachi.
Acquired mystic art for the tonfa.
Acquired mystic art for the hatchets.
Acquired mystic art for the switchglaive.
Acquired mystic art for Ninjutsu.
Acquired mystic art for Onmyo Magic.
Used the Brute, Feral, and Phantom Burst Counters five times each to counter a Burst Attack.
Forged an item.
Remodeled a piece of equipment.
Appraised your tea utensils 50 times.
Displayed a calligraphy scroll in your hut.
Used the Kodama Bazaar.
Completed 10 missions with NPCs or as Expeditions with other users. (Does not include Acolytes.)
Summoned an Acolyte from a Benevolent Grave 10 times.
Completed your first Twilight mission.
Bathed in every hot spring.
Defeated all types of yokai.
Collected all Kodama.
Collected all Guardian Spirits.
Obtained a Kodama's Soul Core.
Obtained all Soul Cores.
Fused any Soul Core until it reached rank 9.
Discovered 10 hidden items on the map.
Dispelled every instance of the Dark Realm in the main missions.
Became Ryunojo the Dung Lover's best friend and received the Coiled Snake Helmet smithing text.
Encountered all the Usura-Hicho in "The Frenzied Blaze".
Destroyed every Amrita shard in "The High-spirited Demon".
Defeated the boss of "The Viper's Sanctum" without breaking the statue of Shirohami.
Defeated each of the Seven Spears in "Cherry Blossom Viewing in Daigo".
Drove back every Tatarimokke along the journey in "A Way Out".
Got Gyuki to attack the dam in "Pervading Waters".
Rang all the bells in "Ruin Draws Near".
Completed "A Song to Calm the Storm".
Completed "Eternal Rivals".
Completed "Shadows Creep in Kurama".
Collected all Kodama in "The Tengu's Disciple".
Acquired mystic art for the splitstaff.
Collected all of Saigyo's poetry cards.
Bathed in every hot spring found in "The Tengu's Disciple".
Used all the giant bows in "A Song to Calm the Storm".
Destroyed 150 of the golden Amrita shards found in the gold mine in "Eternal Rivals".
Used an attack to knock Yoshitsune off his perch on the bridge in "Eternal Rivals".
Completed picture scroll missions 10 times.
Completed "Suzune in the Flames".
Completed "The Blighted Gate".
Completed "Palace of the Damned".
Collected all Kodama in "Darkness in the Capital".
Acquired mystic art for the fists.
Lit all fire altars in "Palace of the Damned".
Bathed in every hot spring found in "Darkness in the Capital".
Completed "The Dragon's Kin".
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.
Attained 100% Penitence on a Stone of Penance.
Completed "Dawn of the Demon".
Completed "A Distant Dream".
Collected all Kodama in "The First Samurai".
Used a cask of holy water in "Dawn of the Demon" to damage an enemy's Ki.
Completed "The Alluring Ancient".
Bathed in every hot spring found in "The First Samurai".
Saved all the Mujina in "A Distant Dream".
Defeated the four demons in "A Distant Dream".
Completed "Against All Comers" on Dream of the Demon or higher.
Collected all of Kukai's brushes in "Words of Respite".
Obtained the aid of Tokichiro, Minamoto no Yoshitsune, and Minamoto no Yorimitsu from a Benevolent Grave in "A Familiar Glow".