As today the daily challenges (26/5) are;
Win a game (works with all roles)
Complete 3 games queued all roles (I get support here)
Contest/capture objective for 250 seconds (all roles)
Earn 12 saves ( support only)
Heal 10k damage with weapon (support only)
Earn a triple kill/assist (all roles but support have easier with the assist)
This are for today but 90% other days looks the same! They need to ad 2 more dailies. So each roll get 2 dedicated dailies. Or at least dedicate the list for your main roll!
A bit of off topic but still could we get some extra xp even for the rest dailies?