| Achievement | How to unlock
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| Defeat 2,000 Taken. | You have defeated 2,000 Taken.
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| Escape the Taken to the motel. | You reached the relative safety of the motel.
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| Find all of the manuscript pages. | You got every manuscript page in the game.
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| Get 70,000 points in any Nightmare Arcade level. | You got 70,000 points in a Nightmare Arcade level.
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| Get a six-minute survivor streak and over 100,000 points in an Arcade level. | You got a six-minute survivor streak and over 100,000 points in an Arcade level.
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| Make sure Dr. Meadows can take another look at the skies. | You secured the coolant tanks at the observatory.
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| Rewrite reality for the first time. | You rewrote reality and brought down the satellite.
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| Rewrite reality for the last time. | You used Mr. Scratch's own trap to destroy him.
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| Survive an Arcade level using nothing but the flashlight and handheld flares. | You survived an Arcade level using nothing but the flashlight and handheld flares.
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| Survive until dawn in any Arcade Mode level. | You made it through the night and enjoyed a nice sunrise in one of the Arcade levels.
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| Take out two Splitter spawns with a single shot. | You took out two Splitter spawns with a single shot.
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| Unlock all of the Nightmare Arcade Mode levels. | You have unlocked all of the Nightmare Arcade Mode levels.
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