Here is the full list of all 12 Alan Wake's American Nightmare achievements worth 200 gamerscore.
You rewrote reality and brought down the satellite.
You made it through the night and enjoyed a nice sunrise in one of the Arcade levels.
You survived an Arcade level using nothing but the flashlight and handheld flares.
You reached the relative safety of the motel.
Make sure Dr. Meadows can take another look at the skies.
Rewrite reality for the last time.
Get a six-minute survivor streak and over 100,000 points in an Arcade level.
Unlock all of the Nightmare Arcade Mode levels.
Get 70,000 points in any Nightmare Arcade level.
Take out two Splitter spawns with a single shot.
Find all of the manuscript pages.
Defeat 2,000 Taken.