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