A good category could maybe have to do with the biomes and like going 5 area's on endless or more. For Example:

Biome%(Or something like endless) Sub. Categories -Darkwood ---Go through 5 areas ---10 ---ect. -Anura -Anchordeep -Silk Cradle (Same for each one)

I was thinking something of a foot race from point A to B and try to get the fastest time idk just a thought