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