Finish the game on any difficulty.
Find all written documents.
Find all lost signals.
Obtain the Riven ending.
Find the eighth signal.
Get handy!
Obtain the flamethrower.
Find the seventh signal.
Find the sixth signal.
Obtain the shotgun.
Craft the Bow and Arrow.
Find the fifth signal.
Find the fourth signal.
Find the third signal.
Find the second signal.
Find the first signal.
Finish the game on Punished difficulty.
Finish the game on Intended difficulty.
Obtain the Reunion ending.
Find a record of events.
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Use the car jack.
Use the terminal.
Find Disk 1/3.
Find Disk 2/3.
Find Disk 3/3.