devtrackers.gg
It would be nice to know how many enemies are in the challenge, what the goal of the challenge is, without scaling to 1000 points (e.g. 17 headshots and 12 weak spot shots for Wolf Trial in Odin Mine Hideout).
Also some spare enemies would be more than welcome, to make the challeges little bit easier.
There you'll be able to gain more discussion from the playerbase and community team!