Can you drill into foundation wall?
Furthermore, is it OK to drill into basement wall?
A: Drilling into concrete isn't impossible — special masonry drill bits are available — but you're right to be cautious about drilling holes in the walls of a dry basement. Toggle (or Molly) bolts will work if there is about an inch of space between the concrete and the drywall.
Beside this, is it safe to drill into foundation?
It's safe to drill into the slab and foundation, as long as it's not big holes. And you don't want two access holes/ slots coming in at a 90 degree angle to each other. The possible problems later on could be moisture ingress, and bug ingress.
Don't let concrete walls stop you from hanging your wall decor, though. You do not have to live with bare walls just to enjoy the feel of authentic cement walls in your home. With special materials, it is possible to hang items on cement walls. Cement is a relatively unyeilding surface, particularly to brads and tacks.