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