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