Got near the end (I think) where I used the last key to open the basement hatch, but interacting with it gives this error report:
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ERROR in
action number 1
of Alarm Event for alarm 0
for object obj_cellar:
Variable <unknown_object>.steam_get_achievement(100223, -2147483648) not set before reading it.
at gml_Object_obj_cellar_Alarm_0
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gml_Object_obj_cellar_Alarm_0 (line -1)