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.
Opened all lockers.
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)
Collected all of the Mysterious Objects.
Completely upgraded all weapons.
Avoided unnecessary bloodshed outside City Hall. (Ch. 5)
Killed 2 or more enemies at once using oil on the ground.
Opted for a cinematic experience.
Completely upgraded all abilities.
Collected all files.
Killed an enemy using an Ambush.
Killed 3 enemies using upgraded Smoke Bolts.
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.
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)
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.
Opened 16 lockers.
Upgraded a weapon to Level 3.
Survived an ordeal with the help of a new friend.
Shut down a bloody performance.
Upgraded one of your Warden Crossbow bolts to max level.
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.
Completed the "Rogue Signal" side mission.
Killed 60 enemies.
Used your first Red Gel.
Killed 30 enemies.
Used your first High-Grade Weapon Parts.
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.