Question about pantheon emblem (highscore).

Well, me and my buddies want that title so we did all three weeks of challeng with platinum.
But we got stuck at Rhulk like 3~4hours to get the platinum run, so I want to know how did the highscore triumph works?

I saw someone said you can't get highscore from loading Rhulk save point and do it without plat but instead you can still get highscore from only complete Oryx and Rhulk both in the same run without plat.

So I was wondering do I need plat to get highscore? Highscore count as total or separate for each boss? Kinda worry about next week's Riven and Nezarec.