I think it should be like it is, I mean the medal is really easy to get since you earn it by wave and not by phase, if you want to get those medals easily just play supernova and squart blocks, besides there are longer missions than that such as exploring landmarks, exploring constellations and star systems, in addition to the precision medal
The medal does not award by wave, its by stages [1x(x)] so by playing squawk and supernova all you can be getting is one, but by it is 3-4 medal depending on your playtime
Sorry, I think I misunderstood or it was a bad translation, but if this is achieved in stages and since I get used to being in the same range for more than a week, it wouldn’t be bad to play daily missions since they are 10x10 per day, if you calculate with the 140 and the ones you already have plus the missions of the planets. It takes at least 1 week and something or less if you are a hero who prefers to save the world without having 1 second rest