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.
Stopped a true believer from playing with his favorite toy. (Ch. 11)
Stomped and killed 15 fallen enemies.
Stunned an enemy standing in water using a Shock Bolt.
Killed 3 enemies using upgraded Smoke Bolts.
Collected all of the Mysterious Objects.
Completely upgraded all weapons.
Brought your own equipment to the barbecue this time. (Ch. 14)
Opened all lockers.
Crafted every type of item at least once.
Talked to Kidman about all of the photographic slides.
Collected all files.
Completed the "The Last Step" side mission.
Reminisced about every moment from your past. (Ch. 12)
Experienced every traumatic encounter and made peace with your inner demons.
Upgraded one of your Warden Crossbow bolts to max level.
Used every Coffee Maker at least once.
Opened 16 lockers.
Observed all Residual Memories.
Killed 2 or more enemies at once using oil on the ground.
Avoided unnecessary bloodshed outside City Hall. (Ch. 5)
Completely upgraded all abilities.
Upgraded a weapon to Level 3.
Opted for a cinematic experience.
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.
Killed an enemy using an Ambush.
Made it inside the enemy's stronghold.
Came to terms with your past and present.
Provided a Harbinger sweet release.
Used your first Red Gel.
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.
Collected 20 files.
Found a potential ally in The Marrow.
Defeated the Guardian outside City Hall.
Killed 60 enemies.
Saw a chilling vision.
Used your first High-Grade Weapon Parts.
Acquired the Warden Crossbow.
Completed the "Rogue Signal" side mission.
Killed 30 enemies.
Killed 10 enemies using Sneak Kills.
Crafted something for the first time.
Took the plunge back into STEM.