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