Here is the full list of all 30 House of Hell achievements.
Find the ultimate ending in Medium mode
Find the ultimate ending in Hardcore mode
Find all the artwork in House of Hell
Enter all the locations in the house
Escape from an invisible entity
Sample all of the wine in the house
Find all art pieces for Dan Maxwell's alternative cover
Find all the potential weapons in the house
Kill five very large dogs
Collect 100 FEAR points!
Deal with a mischevious poltergeist
Get maximum points in the torture word game
Get a Hunchback drunk
Collect 70 FEAR points
Find all the keys within the house
Find the secret room
Find the ultimate ending in Free Read mode
Escape the House of Hell
Check out all the paintings on display
Have faith in a ghost
Meet a ghoulish creature
Find yourself stuck in two story loops of doom
Collect 30 FEAR points
Use a pot-plant in a clever way
Collect 10 FEAR points
Slip in a pool of blood
Find your way into a sacrificial ceremony
Meet all the zombies within the house
Fall under the spell of a vampire
Collect your first FEAR point