Very simple, just watch five episodes of the same show within the app. thank you zsoltee53 for confirming. I watched 5 episodes of the same and got it on the first day. If you are a free user you can watch 5 episodes of This Is Not Happening for free. Episode S02E02 counted as 3 watched episodes for zsoltee53.
You must watch an entire show through the credits for it to count. You can fast forward (confirmed), but you cannot quit out.