Here is the full list of all 28 Mirror Forge achievements.
Use a Mirror to travel.
Get the Seal of Nur.
Find the Silent Hill Easter Egg
Poke the Eye
Find the 14 Frozen Moments.
Show Mercy and fry the suffering Depression Monster.
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.
Read the old tome in the Industrial Zone.
Find the book about the Anunnaki in the Mirror Forge Facility.
Make the acid in the Industrial Zone.
Reveal the forgotten truth.
Get to the countryside of Goreburg.
See the massive beast in the Industrial Zone.
Experience the scare in the Hangar facility.
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.