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