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