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