Here is the full list of all 14 ALONE? achievements.
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Find and Unlock Ending 4
Find and Unlock Ending 2
Find and Collect the Car Keys
Enter the Morgue
Enter the Sewer
Replace 3 Piano Keys
Return the Jesus Statue
Find and Unlock Ending 3
Collect all Screws
Enter the Basement
Unlock the Safe
Find and Collect the Flashlight
Find and Unlock Ending 1