Here is the full list of all 38 Alone in the Dark achievements.
Join a cult
Save New Orleans from the Black Goat
Talk to everybody about everything
Give Grace a present
Submit to the Dark Man
Consider ending it all
Own up to your awful past
Find all the lagniappes
Break the Pact with the Dark Man
Play for more than 8 hours
Enter hell
Get what you want
Break through the barriers of self-deceit
Return to Derceto
Walk into the desert
Kill an enemy with Tommy gun
Escape the Dark Man
Talk to Jeremy in the chapel
Find the Convent of Taroella
Aim your gun at a human being
Kill an enemy with shotgun
Finish a Lagniappe set
Find Jeremy’s bag
Break through a barrier
Put a talisman socket back together
Find your own talisman
Kill an enemy with fire
Kill a monster with an opportunity
Kill a monster with a melee weapon
Kill a monster with a ranged weapon
Break into Derceto
Finish the game in 3 hours or less
Open all of the safes and locks in the game.
Finish the game without drinking from your flask
Read all the clues
All Achievements