Here is the full list of all 9 Mist achievements.
Get lost at night and join them.
Gather all shotgun ammo in game from all the ridiculous spots. Congratulations!
Not the best outcome, but certainly not the worst either.
But did you really escape?
Break the cycle.
Let there be light!
Remain silent.
By pure accident, do only those things that are necessary to get out of the forest. But you're here for the first time...or are you?
Enter the fog.