I think I may be done with the game, because the points on massive jumps seem entirely arbitrary. I just had a run where twice in a row my jump was done at more than 80kph with a multiplier over 60, I was in the air for 5 full seconds with a maximum height over 2k and jumped 7 or more gates, drawing only as necessary as I was about to land, and my score was... a massive 150k. Seriously, I had a huge jump, landed, went through a tunnel to get my Solipskier even more badass, jumped again, and got nothing for either of them. Meanwhile, earlier, I had a couple jumps come in at 450k where I jumped 5 gates with a lower multiplier.
On the other hand, it looks like if you're patient enough you can get the 50m point medal just by playing it safe for half an hour. So if you're absolutely desperate for that medal, and have nothing better to do... there you go.
I think I'm going to file this game under "too tedious to get the remaining medals, but still pretty fun overall." I'm done hunting this game's medals.