Acquaintances can be people that are friendly and nice, but not necessarily the first person I would walk up to in a room of people, unless I had no choice.
Friends are people that I can be my true self around, that I can talk to about whatever is on my mind, and joke with. I can’t usually joke with acquaintances.
If I talk to someone outside of work, college… I call them my friend, everyone else - acquaintances? I think… I don’t know… I don’t know how to explain that, it’s not that easy. It really depends