I play a few hours here and there and I'm halfway done with the 1200 medal points. 1) watch a Twitch streamer for 2 hrs and you'll get a diamond medal. That was a huge chunk of my points. ~250 or 300 (I didn't check what I had before I turned in the diamond.) You get one a week. 2) Grab the Platinum bounties. I was doing Lost Sector ones after they unlocked them. You just have to kill enemies. Usually takes 1 1/2 runs of a Lost Sector. I was also grabbing Platinum Nightfall bounties. These two are the quickest imo, since I tend to avoid PvP. Make sure to grab Platinum bounties