For this achievement, you've just gotta make like Corey Hart and wear your sunglasses at night.
To unlock the sunglasses, just soak all the hoomans on Beach while avoiding the sun. To don the sunglasses, go back to the hub, press view (
) to go into your home. Go to Decor and switch to Sunglasses in Accessories.
to confirm, then back out to the hub.
Work your way up to Spoopy Forest Road, which is the level