Here is the full list of all 12 THE DESCENT achievements.
Your journey begins
Investigate the Coal Building
Descend 500 feet below the surface
Venture below 1000 Feet
Unwelcomed by the Ghost.
Read all Notes in the Coal Mine Abyss Map
Seek Emma's Photo in Happier Times
Read All Notes / Posters / Newspaper in the RockWell Mine Game.
Read all Notes in the Coal Mine Map.
Encounter John Wilson
Enter The Devil's Forsaken Realm
A Miners Paradox Explained