Activating multiple switches for one door.

I’m currently making a level and the idea is that you’re going around finding this glyphs that you can click on and once you’ve found them all a locked door opens up. I’m pretty sure I could do this if it was just one switch but I’m not sure how to communicate that all switches need to be pressed before the door opens. Basically, finding x many of objects opens y. The door in question will basically just be a wall that sort of disappears so I’m thinking I can link it to a destroy actor node to get what I want but not sure of anything beyond that.