You need to stay at a brand two times to get the badge.
That's definitely not true for the 5 brand badge. I stayed this year at
Luxury Collection
Sheraton
St Regis
W
and finally at a single Fairfield stay and it was after the Fairfield stay I got my 50 points 5 badge stay.
And I've added an AC and Westin since then, but those haven't posted yet.