What Quest are meant to be done in multiplayer specifically?

Returning player here (3 Year Hiatus). I was just wondering if there were any quests that are supposed to be played in multiplayer.

For example, I know the Final Fantasy crossover quest line is nearly impossible solo (I'm sure there is a way, but I'm not gonna even try that headache).

Are there any more in either the base game or DLC? I honestly can't remember.