Shoot down all anomalies
Collect 10 notes as Adam
Collect 10 notes as Nicolas
Defeat John Norton
Chase away Norton's Ghost 10 times in the woods
Find 10 hidden messages
Complete Chapter 1
Find the Key to the Attic
Unlock all achievements
Ending No. 3
Ending No. 4
Solve the Enigma
Collect all notes as Adam
Collect all notes as Nicolas
Ending No. 1
Collect all newspaper clippings
Finish the game
Choice No. 2
Ending No. 2
Hear every news message on the radio
Choice No. 1
Defeat Walter Gilman
Find all Harold's notes
Find all hidden messages
Collect 50 boxes of matches
Light 30 candles
Collect 50 bottles of kerosene