If you have trouble finding one of the hideouts, I have a video for you. I speak German but you don't need my voice to find the spots, so you can mute me or turn on the translater.
1. I play on the family house map because, to my knowledge that's the only map with all the hiding places
2. You dont have to find all the hideouts in one round
3. You can use Sissy for the Achievement
4. I show the hiding places in the following order (i start in "Leatherface Lair") - trunk, freezer, locker, wardrobe, car trunk