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.
Completed "A Distant Dream".
Collected all Kodama in "The First Samurai".
Defeated the four demons in "A Distant Dream".
Saved all the Mujina in "A Distant Dream".
Bathed in every hot spring found in "The First Samurai".
Completed "Dawn of the Demon".
Completed "Palace of the Damned".
Collected all Kodama in "Darkness in the Capital".
Bathed in every hot spring found in "Darkness in the Capital".
Lit all fire altars in "Palace of the Damned".
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.
Listened to the innermost thoughts of a Yokai Weapon.
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".
Completed "A Song to Calm the Storm".
Used all the giant bows in "A Song to Calm the Storm".
Forged an item.
Saw Tokichiro off on his final departure.
Defeated all types of yokai.
Reached level 100.
Fulfilled your ultimate destiny.
Defeated each of the Seven Spears in "Cherry Blossom Viewing in Daigo".
Displayed a calligraphy scroll in your hut.
Reunited with your mother in the Interim.
Destroyed every Amrita shard in "The High-spirited Demon".
Fused any Soul Core until it reached rank 9.
Defeated Tokichiro.
Rang all the bells in "Ruin Draws Near".
Parted ways with Tokichiro.
Encountered all the Usura-Hicho in "The Frenzied Blaze".
Used the Kodama Bazaar.
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.
Defeated Imagawa Yoshimoto and was made a samurai.
Completed your first Twilight mission.
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 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.
Performed a Soul Match.
Remodeled a piece of equipment.
Appraised your tea utensils 50 times.
Summoned an Acolyte from a Benevolent Grave 10 times.
Bathed in every hot spring.
Collected all Kodama.
Collected all Guardian Spirits.
Obtained a Kodama's Soul Core.
Obtained all Soul Cores.
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.
Defeated the boss of "The Viper's Sanctum" without breaking the statue of Shirohami.
Got Gyuki to attack the dam in "Pervading Waters".
Acquired mystic art for the splitstaff.
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 fists.
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.
Used a cask of holy water in "Dawn of the Demon" to damage an enemy's Ki.
Completed "The Alluring Ancient".
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".