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.
Completely upgraded all weapons.
Brought your own equipment to the barbecue this time. (Ch. 14)
Collected all files.
Killed 2 or more enemies at once using a hanging lamp. (Ch. 9)
Acquired all standard weapons.
Killed 3 enemies using upgraded Smoke Bolts.
Upgraded one of your Warden Crossbow bolts to max level.
Defeated the Guardian outside City Hall.
Completely upgraded all abilities.
Completed the game in Classic Mode.
Opened all lockers.
Crafted every type of item at least once.
Talked to Kidman about all of the photographic slides.
Killed 2 or more enemies at once using oil on the ground.
Opted for a cinematic experience.
Completed the game on Casual difficulty or higher.
Completed the game on Survival difficulty or higher.
Completed the game on Nightmare 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.
Made it inside the enemy's stronghold.
Completed the "The Last Step" side mission.
Upgraded a weapon to Level 3.
Came to terms with your past and present.
Reminisced about every moment from your past. (Ch. 12)
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.
Killed an enemy using an Ambush.
Survived an ordeal with the help of a new friend.
Shut down a bloody performance.
Opened 16 lockers.
Killed 10 enemies using Sneak Kills.
Found a potential ally in The Marrow.
Collected 20 files.
Avoided unnecessary bloodshed outside City Hall. (Ch. 5)
Stomped and killed 15 fallen enemies.
Used your first Red Gel.
Killed 60 enemies.
Saw a chilling vision.
Used your first High-Grade Weapon Parts.
Completed the "Rogue Signal" side mission.
Killed 30 enemies.
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.