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