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