Full list of all 51 Aragami achievements. It takes around 15-20 hours to unlock all of the achievements in the base game on Windows.
The base game contains 39 achievements, and there is 1 DLC pack containing 12 achievements.
Complete Nightfall: Chapter I
Complete Nightfall: Chapter II
Complete Nightfall: Chapter III
Complete Nightfall: Chapter IV
Recover all Nisshoku katanas
Kill two enemies at once with the help of Twin Shadow (Single Player)
Kill 4 or more enemies at once with the Explosive Kunai
Obtain all “Kami” medals in “Nightfall”
Obtain all “Oni” medals in “Nightfall”
Obtain all “Yurei” medals in “Nightfall”
Kill the Alchemist's messenger
Blind 4 or more enemies with a Shadow Grenade