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