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