Here is the full list of all 12 A Light in the Dark achievements.
Survive the beginning.
I'd rather die than submit.
The morning sun has risen.
You can never have too much of a game with a rabbit-eared girl.
Discovered the relationship between those two girls.
The rich boy is sick.
A warmth that everyone has.
Keep going even with hands covered in blood.
The rain will never stop.
The future she expects to see.
A faint glimmer that guides the way.
Unlock all achievements.