Here is the full list of all 18 Shrieking Darkness achievements.
Enter the Walker's mansion.
Kill 5 or more test subjects.
Complete chapter 1.
Inject the nanobody serum into your veins.
Die at least once when fighting.
Crawl through the underground tunnel to the mansion.
Open the journal.
Heal yourself with a first aid kit.
Kill an enemy using nothing but your fists.
Dodge an enemy attack.
Arrive at the target destination.
Win your first boss battle.
Kill your first test subject.
Play on very hard difficulty.
Gain your first 200 XP when playing minigames.
Gain at least 600 XP from minigames.
Gain at least 1000 XP from minigames.
Play on extreme difficulty and prove just how cool you are.