i figured out how to get 7 challenge completions without much pain. As soon as you unlock challenges i suggest first you beat challenge 1 three times. Then you beat challenge 2 two times and go to challenge four with "base is always five below cactus(omega)". At this point you have 6 completions and might feel stuck but you are able to beat challenge 3 one time with "base is reduced by 4 if its above 7" it might be hard (about 5-6 hours) to get 1e100 OP with base five but after you reach base 4 its not much of a problem to get 1e200 OP and boom you have 7 challenges
i like this game a lot but i dont like the thing that when you reach wisdom point it becomes "spam craft pickaxe untill cool pick". it would be cool if something that makes that part of game more "active" and not just afk'ing