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