Sunny was the last hunter I need elite for a while and mostly because I was stuck on the shield done. imo it is hard to shield 2,000 damage in a 12~ match. I ended looking for a way to farm the challenges quickly and I found a strategy that works well and I thought I would share it and see if it could help other people as well
First off I’m doing this solo. The gametype doesn’t matter just make sure you pick the map Barracks.
Once you spawn in map your way to the pillar with smoke/steam/whatever coming out of it
Simply stand on top of the pillar with your shield drone and you will constantly take damage but the shield drone will block it.
You can tell when you hit 2,000 damage shielded by paying attention to your awards. Specifically the shield drone award for blocking 750 damage. After getting this award three times you already got over 2,000 damage shielded and you can end the match however you like.
Note: You also work on your jetpack booster while doing this.
If you’re still working on Sunny’s materies I hope this helped
Edit: @zind 's idea for using the acid cloud map effect sounds just as good if not better.