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