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