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.
Collected all of the Mysterious Objects.
Opted for a cinematic experience.
Crafted every type of item at least once.
Brought your own equipment to the barbecue this time. (Ch. 14)
Opened all lockers.
Collected all files.
Completely upgraded all weapons.
Reminisced about every moment from your past. (Ch. 12)
Stopped a true believer from playing with his favorite toy. (Ch. 11)
Killed an enemy using an Ambush.
Killed 2 or more enemies at once using a hanging lamp. (Ch. 9)
Observed all Residual Memories.
Completely upgraded all abilities.
Opened 16 lockers.
Avoided unnecessary bloodshed outside City Hall. (Ch. 5)
Killed 3 enemies using upgraded Smoke Bolts.
Talked to Kidman about all of the photographic slides.
Upgraded one of your Warden Crossbow bolts to max level.
Stunned an enemy standing in water using a Shock Bolt.
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.
Stomped and killed 15 fallen enemies.
Your trauma is no more.
Made it inside the enemy's stronghold.
Completed the "The Last Step" side mission.
Came to terms with your past and present.
Provided a Harbinger sweet release.
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.
Collected 20 files.
Shut down a bloody performance.
Killed 2 or more enemies at once using oil on the ground.
Found a potential ally in The Marrow.
Defeated the Guardian outside City Hall.
Used your first Red Gel.
Completed the "Rogue Signal" side mission.
Saw a chilling vision.
Upgraded a weapon to Level 3.
Killed 60 enemies.
Used your first High-Grade Weapon Parts.
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.