You must have a level 17 Palace or above and for level 1 complete ten daily quests; for level 2 complete fifteen daily quests; for level 3 complete 25 daily quests, level 4 complete 40 daily quests; level 5 complete 55 daily tasks.

There are also youtube videos coming out now with these numbers.

do 6 daily quests in a day  for level 1

This may be how you got it, however there are only 6 daily tasks, and I have never done 500 legendary tasks,so have never finished all 6,and I would be hard pressed to say I definitely did 5 of them ever,and a few days ago,much to my surprise I found that I had Sisyphus 1. 

You don't have to do ten/ fifteen/ twenty five/ forty/ fifty five all at once, you can accumulate them over a period of time.

yes quite simple

Hope this helps. Easy to lose count of where you've got to so comes as a pleasant surprise.

i

As with your other post about Totem shortages. Presumably it the same scenario.

I hate it when they keep moving the targets further away when its hard enough to reach them anyway. Particularly annoying when you are part through a level only to find they increased the palace requirement.

Not that after all this time I expect them to pay fair, but it is so unfair that they do this, and its extremely disadvantageous to new players, who have it tougher to do, and yet are drawn against those that have reached goals through a much easier route.

Whilst I am here, another bone of contemptionis being locked out of the seasonal store due to the recently introduced minimum palace requirement.

They do no favours to anyone, not even those that spend vast quantities of money,even though the same think that they do, therein lies the trick.

(edited here:thought twice when I wrote contemption,should be contention,but contemption fits the bill near enough)