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