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