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