No missable achievements (plus 17 unknown)
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Get screamed at by the Ghast 3 times.
Get killed by the Predator more than 3 times.
Get hit by the Predator 5 times without dying.
Make the Lighter blow out by moving mouse quickly.
Play through the whole game without consuming any drugs.
Get strangled by the sniper more than once in Dream II.
Pick up 100 items.
Complete the game without taking any damage.
Pull the Lever in the wrong direction 5 times.
Collect all notes in a single playthrough.
Consume 100 pills.
Play thourgh the whole game without using any batteries.
Remain in constant motion for 5 minutes.
Turn off the water in under 1 minute in Dream I.
Complete the game in under one hour.
Collect all the meatball cans.
Complete game without using the Lighter or the Flashlight.