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