I can't seem to get he F39 insect-only objective. The only monsters in my deck are Gokipon, Warm Worm, Man-eater Bug, and Golden Ladybug. It refuses to complete.
I don't think dna surgery works. Also, I notice system only counts the monsters cards in your monster zone. I used a bacon saver (activated in grave) in my lightsworn deck for "all light" mission by mistake and the mission still clears.
100% is only for veteran players with huge card pool. Don't over exert yourself. Remember there's still 41-45 and they are definitely harder than current ones.
But if you insists on completion, you can try that weevil spell where you tribute insect to special summon higher level monsters. Huge beater + staples spell trap should eventually net you the victory.