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.
Obtain all 'Oni' medals
Obtain all 'Kami' medals
Obtain all 'Yurei' medals
Unlock all Skills
Find all Scrolls
Complete Chapter 13
Complete Chapter 12
Complete Chapter 11
Get killed by an arrow while throwing a 'Kunai'
Use an explosive light to kill a guard
Complete Chapter 10
Perform a Ceiling Kill
Perform an aerial kill from a 10m height
Die. Again. And again.
Use 'Shinen' to swallow 3 guards at the same time
Complete Chapter 9
Complete Chapter 8
Perform a Ledge Kill
Complete Chapter 7
Perform your first Shadow Kill
Summon 100 shadows
Complete Chapter 6
Kill 100 enemies
Make a guard suspicious 3 times in a row
Completer Chapter 5
Concatenate multiple stealth kills
Die while performing a stealth kill
Complete Chapter 4
Destroy a Light Orb
Complete Chapter 3
Unlock a Skill
Complete Chapter 2
Perform 100 Shadow Leaps
Find a Scroll
Obtain a 'Kami' medal
Complete Chapter 1
Obtain a ‘Yurei’ medal
Obtain a 'Oni' medal
Skip a cinematic
Obtain all 'Oni' medals in 'Nightfall'
Obtain all 'Kami' medals in 'Nightfall'
Kill two enemies at once with the help of Twin Shadow (Single Player)
Complete Nightfall: Chapter IV
Obtain all 'Yurei' medals in 'Nightfall'
Recover all Nisshoku Daggers
Blind 4 or more enemies with a Shadow Grenade
Kill 4 or more enemies at once with the Explosive Kunai
Complete Nightfall: Chapter III
Complete Nightfall: Chapter II
Complete Nightfall: Chapter I