Pretty sure i've been getting my daily reward for 1 week now, and I still have 0% completed.

Is there some other daily reward im missing? It's where you go to visit an island and get all the crates, yes?

No that's not it, the Daily Reward crates have been disabled for now so unfortunately you can't get that achievement at the moment.

The Daily Reward will be back soon.

The thing you get from visiting friends is just a little bonus to encourage you to visit friends. You'll see more about why you'll be doing this in the next update. Maybe. ;)