As stated, best to explore for rewards of those Objectives you can get while solo'ing. Note: Maximum # of Objectives that will be listed is 3.
#1: Explore the maze from level 1, if you fall in a Trap door, it is up to you to carry on, just note that the catacomb SIZE you explore now will most likely increase from a 5x5 catacomb to a 6x5 or more.
#2. Once you get first objective, and are still like level 1 to 8, you can OPT to Whistle to level 10 and then start a new Catacomb to open up a Maximum of 3 Objectives ... which are:
... Pinch (level 6 requirement) ... also Note: Disable Easy Mode to ensure a chance of 3 EPs to spawn.
... Bits (level 7 requirement) ... you could whistle this if I remember correctly, but also get while hunting for Pinch
... Hack ... again, Disable Easy Mode to ensure max 3 monster spawn.
#3: Some people whistle to level 12 ... note, you won't be able to complete Face the Evil... this will still appear in your Objectives list to Master Quest (Solo) ... Stop the 7 Shamans will be another nuisance in your maximum of 3 in the list.
#4: Melee doesn't work on Soften the Sneaky Shell, just casting... you may want to avoid this one or ask for help from others and create a game to join in to kill it for you or exit game and remake catacomb to remove it completely ... even from your list.
#5: Treasure Pest is an EP (single) ... you may want to use Easy Mode while exploring catacomb at higher levels... up to you.
#6: Or you can join a group that is willing to carry you and they may whistle to a set level and then explore to get objectives.
Good luck and have fun... oh... Ambush, you can complete that if you are lucky to get objectives done earlier.
This is very helpful - thanks!

Someday I'll have to try a group climb and see if we can check off all of the objectives in one go.
From 55 - 61 I have been going through the same maze and it does not seem like there is any end in sight! Is it pretty typical to have one maze that lasts from 55 - somewhere in mid 60's / 70? At this rate I am pretty confident I'll still be running this maze by
at least level 65