Here is the full list of all 51 The Evil Within 2 achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Found a potential ally in The Marrow.
Collected 20 files.
Defeated the Guardian outside City Hall.
Upgraded a weapon to Level 3.
Stomped and killed 15 fallen enemies.
Used your first Red Gel.
Saw a chilling vision.
Killed an enemy using an Ambush.
Used your first High-Grade Weapon Parts.
Killed 60 enemies.
Completed the "Rogue Signal" side mission.
Killed 30 enemies.
Killed 10 enemies using Sneak Kills.
Stunned an enemy standing in water using a Shock Bolt.
Acquired the Warden Crossbow.
Crafted something for the first time.
Took the plunge back into STEM.
Completed the game on Casual difficulty or higher.
Completed the game on Survival difficulty or higher.
Completed the game on Nightmare difficulty or higher.
Completed the game in Classic Mode.
Shut down a bloody performance.
Survived an ordeal with the help of a new friend.
Provided a Harbinger sweet release.
Came to terms with your past and present.
Made it inside the enemy's stronghold.
Your trauma is no more.
Reached the very end of the world.
Did what needed to be done to save your daughter.
Completed the "The Last Step" side mission.
Experienced every traumatic encounter and made peace with your inner demons.
Completely upgraded all abilities.
Upgraded one of your Warden Crossbow bolts to max level.
Completely upgraded all weapons.
Crafted every type of item at least once.
Observed all Residual Memories.
Collected all files.
Opened 16 lockers.
Opened all lockers.
Talked to Kidman about all of the photographic slides.
Acquired all standard weapons.
Collected all of the Mysterious Objects.
Used every Coffee Maker at least once.
Killed 3 enemies using upgraded Smoke Bolts.
Killed 2 or more enemies at once using oil on the ground.
Avoided unnecessary bloodshed outside City Hall. (Ch. 5)
Killed 2 or more enemies at once using a hanging lamp. (Ch. 9)
Stopped a true believer from playing with his favorite toy. (Ch. 11)
Reminisced about every moment from your past. (Ch. 12)
Brought your own equipment to the barbecue this time. (Ch. 14)
Opted for a cinematic experience.