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