Also would you suggest the Act 5 Cursed Peat or Act 3 Cursed Bellows?

bmp

I thought the only cursed thing in D3 is the game itself

C-c-cu-cursed game?
AAAAAAAAGGGHHHHHHIIIIIIIIIIEEEEE!!

I had a buddy do this for me this season because I started super late. I can't remember exactly which one they did, but they did it solo. There is a specific bounty one to look for, I am sure you can google it and get the name.

Skipped totaly. Reached guardian by solo 6 sets, solo with no set and leveling 3 gems.

But to answer you question one AOE build should be enough. Which one no idea therefore skipped.

It is quite easy with GoD DH. I'm sure it can be done with multishot as well, and probably other builds too. I imagine that wave monk could probably do it.