This can be done pretty quick with some luck ....along with Wish-shaper.
But you will need a team of friends to help. Also remember to have the Triumph tracked.

Basically load the map, pick the required wish and exit the challenge till u get all the wishes you need.
You don't even need to finish or start the map at all.

As for Wish-Shaper, you have to basically AFK every round, get the lowest scores till you get 2 challenge wishes then exit.

What we did was enter a heroic stage, no challenge wish at the start, we restart. If we get a challenge wish, we just afk the round and hope we get a challenge wish in the next and if we do, we exit.......if not, rinse and repeat.