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I believe that 'Strange sounds' can be obtained in the room at the end of the hallway during the same day.
In day 8 wait until 10pm, go to the clown room (44 base floor) and collect
the key without getting scared by the cat, then go to the bathroom upstairs (44 1st floor),
grab the key and go to 24 3rd floor.
In day 9, wait until 10pm and go to 36 base floor, grab the key on the floor after the scene and
go to 44 2nd floor, the cat will be behind the door and you just have to not get scared by it.
Finish the day by going to 3rd floor's 4, then 16 and at last 0.
Quit/close the game and you should have the achievement.