Here is the full list of all 15 An Uninvited Guest achievements.
Get your first ending
Succeed with a trap
Get caught in the attic
Get caught while hiding
Trigger your own trap
Get all endings
Succeed with every trap
Reach 1000 clicks
Try to leave through the front or back door while The Guest is around
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Reset the power in 5 or less moves
Succeed with 3 traps within 5 minutes
Complete challenge mode with at least 1 challenge active
Complete challenge mode with at least 3 challenges active
Complete challenge mode with at least 5 challenges active