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.
Remodeled a piece of equipment.
Collected all Guardian Spirits.
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".
Acquired mystic art for Onmyo Magic.
Acquired mystic art for the kusarigama.
Acquired mystic art for Ninjutsu.
Defeated all types of yokai.
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 odachi.
Acquired mystic art for the tonfa.
Acquired mystic art for the switchglaive.
Caused Oboroguruma to release Amrita from its carriage at least 10 times.
Acquired mystic art for the fists.
Collected all Kodama in "Darkness in the Capital".
Acquired mystic art for the hatchets.
Acquired mystic art for the axe.
Acquired mystic art for the spear.
Bathed in every hot spring found in "Darkness in the Capital".
Completed "The Dragon's Kin".
Acquired mystic art for the dual swords.
Acquired mystic art for the sword.
Completed "Palace of the Damned".
Lit all fire altars in "Palace of the Damned".
Acquired mystic art for the splitstaff.
Completed "The Blighted Gate".
Completed "Suzune in the Flames".
Used an attack to knock Yoshitsune off his perch on the bridge in "Eternal Rivals".
Bathed in every hot spring found in "The Tengu's Disciple".
Completed "Shadows Creep in Kurama".
Collected all of Saigyo's poetry cards.
Collected all Kodama in "The Tengu's Disciple".
Completed 10 missions with NPCs or as Expeditions with other users. (Does not include Acolytes.)
Completed "Eternal Rivals".
Destroyed 150 of the golden Amrita shards found in the gold mine in "Eternal Rivals".
Completed "A Song to Calm the Storm".
Used all the giant bows in "A Song to Calm the Storm".
Displayed a calligraphy scroll in your hut.
Defeated each of the Seven Spears in "Cherry Blossom Viewing in Daigo".
Encountered all the Usura-Hicho in "The Frenzied Blaze".
Got Gyuki to attack the dam in "Pervading Waters".
Defeated the boss of "The Viper's Sanctum" without breaking the statue of Shirohami.
Drove back every Tatarimokke along the journey in "A Way Out".
Saw Tokichiro off on his final departure.
Fulfilled your ultimate destiny.
Used the Brute, Feral, and Phantom Burst Counters five times each to counter a Burst Attack.
Reunited with your mother in the Interim.
Destroyed every Amrita shard in "The High-spirited Demon".
Listened to the innermost thoughts of a Yokai Weapon.
Defeated Tokichiro.
Completed your first Twilight mission.
Rang all the bells in "Ruin Draws Near".
Fused any Soul Core until it reached rank 9.
Discovered 10 hidden items on the map.
Defeated Mezuki and Gozuki in the same mission.
Defeated Gozuki in "The Village of Cursed Blossoms".
Parted ways with Tokichiro.
Obtained a Kodama's Soul Core.
Decided to share a name with Tokichiro.
Reached level 100.
Defeated Imagawa Yoshimoto and was made a samurai.
Summoned an Acolyte from a Benevolent Grave 10 times.
Performed a Soul Match.
Exchanged gifts with a Sudama for the first time.
Bathed in first hot spring.
Forged an item.
Reached level 10.
Befriended Tokichiro.
Obtained your first Soul Core.
Used the Kodama Bazaar.
You have unlocked all achievements!
Appraised your tea utensils 50 times.
Bathed in every hot spring.
Collected all Kodama.
Obtained all Soul Cores.
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.
Completed picture scroll missions 10 times.
Defeated Tsuchigumo while equipped with at least one piece of gear with the special effect "Dragon Ninja".
Attained 100% Penitence on a Stone of Penance.
Completed "The Alluring Ancient".
Saved all the Mujina 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".