Here is the full list of all 45 ONINAKI achievements.
Obtained all achievements.
Met Linne.
Witnessed the Seven-Day Sending.
Listened to Lobelia's story.
Learned about Mayura's name from Kushi.
Witnessed Soju's past.
Met Sara.
Viewed all of the wall murals.
Defended the precepts of reincarnation.
Displayed the will to see it through to the end.
Believed in humanity's potential to change.
Hesitated when the time came.
Did not hesitate when the time came.
Defeated Tsukumo.
Defeated a Shadow Fallen.
Defeated 10 Shadow Fallen.
Bound 2 Daemons.
Bound 5 Daemons.
Bound 8 Daemons.
Viewed all the memories of 1 Daemon.
Viewed all the memories of 3 Daemons.
Viewed all the memories of 5 Daemons.
Unlocked a Daemon's entire Skill Tree.
Unlocked 3 Daemons' entire Skill Trees.
Reached an Affinity of 200.
Reached an Affinity of 220.
Manifested 10 times.
Manifested 100 times.
Manifested with every Daemon.
Triggered 10 Awakenings.
Triggered 100 Awakenings.
Triggered every Awakening.
Acquired 10 weapons.
Acquired 100 weapons.
Obtained an epic weapon.
Obtained a legendary weapon.
Socketed 10 shadestones in weapons.
Socketed 100 shadestones in weapons.
Obtained a weapon socketed with 1 or more shadestones.
Obtained a weapon socketed with 3 or more shadestones.
Obtained 1 item from the Alchemist.
Obtained 10 items from the Alchemist.
Was healed by Linne.
Brought Linne to the Sanctum of Reincarnation.
Heard 20 of Linne's battle cries.