This is one of my first guides but other than that this achievement is quite simple
To unlock this, I played as the Daddy and went up the stairs, where there should be a wooden square on the roof. You can enter the attic through this and there should be a tv that says “do not plug in”.
You can guess where this is going. There’s a plug that can be found in the attic and plug it in and boom. Achievement unlocked along with something else.