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