Here is the full list of all 12 Into The Gloom achievements.
Experience the existence as a lesser life form.
Find all the main menu unlockable notes.
Become a homeless.
Disappear forever...
Arrive to the red plane.
Fail to achieve the ultimate goal.
Free the knife dude from the prison yard.
Achieve the ultimate goal.
Visit your home again.
Meet the box of salvation.
Embrace the agony for the rest of eternity.
Escape the lonely underground maze.