asking as the Legendary Hunt challenges releasing today would seem much easier to complete with a squad that communicates vs. randoms - particularly the consecutive top-5 finishes. I'm on Xbox and usually on later in the evenings (9PM est +).

The challenges have not been officially released but here is what I have read...
Finish top 5 in any match = Legendary Hunt Badge
Finish top 5 in an elite top 5 match (top 5 2x in a row) = Rare Wolfpack G7 Scout weapon skin
Finish top 5, 5 times (might need to do this in the same queue) = Epic Master of the Hunt Bloodhound Legend skin
Win twice in any queue = Legendary Tames Beast Triple Take weapon skin