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