Here is the full list of all 28 Mirror Forge achievements.
Poke the Eye
Escape the Invisible Monster in the hangar without taking a hit.
Find the developer.
Inspect the Paper in the drawer in the Long Staircase area.
Find the changing painting in the Facility area.
Find Cageface in the Subway.
Complete the game.
Enter the Prison Dimension.
Find Jill.
Reveal the forgotten truth.
Find the book about the Anunnaki in the Mirror Forge Facility.
Read the two papers in the Homeless Shelter.
Find the first Enlil's Tablet.
Uncover what happened to Jane.
Find the 14 Frozen Moments.
Get to the countryside of Goreburg.
Find out who the dark entity is.
Escape the Woman Monster
Escape the Ashes Dimension.
Listen to the audio log in the Maintenance Room.
Find the Silent Hill Easter Egg
Experience the scare in the Hangar facility.
Show Mercy and fry the suffering Depression Monster.
Read the old tome in the Industrial Zone.
See the massive beast in the Industrial Zone.
Make the acid in the Industrial Zone.
Use a Mirror to travel.
Get the Seal of Nur.