I put together an elaborate guide to achieving gold tier for each strike:
[spoiler]Kill all the enemies.[/spoiler]
[spoiler]Ok, so maybe they just wanted us to stop speed running[/spoiler]
TL;DR
[spoiler]http://xboxdvr.com/gamer/Trox45/video/24476418
[/spoiler]
Edit: Apparently a certain appendage keeps getting stuck in various objects while attempting to follow my guide. Be careful out there guardians!
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Yeah they obviously don't want people to speed run the strikes. Don't know if hitting a tier will make a difference though.