If I was to suggest a badge, I would pick:Shakespeare (Sun Badge): Achieve mastery in 2500 unique skills Double that, and you'll earn...

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2. Feature Requests and General Site Feedback
3. New Sun Badges

So that means that Atlas is just a little bit higher than Maelstrom, making it extremely difficult to earn - but not impossible!

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2. General Khan Academy Questions
3. Black Hole Badges

The Maelstrom badge is in the Badge Page too. It's a Black Hole badge. You have to reach a course level of 100 to earn it.

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3. How do i know if i've gotten Black Hole Badges or not?

The streak feature is already added.Introducing Streaks and Levels! – Khan Academy Help Center

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3. (Re)add DAILY STREAKS to Khan Academy

It seems like Streaks have been reintroduced already, with the introduction of seven new badges: Spark, Flame, Torch, Bonfire, Furnace, Forge, and Pheonix.Look here:Introducing Streaks and Levels! ...

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2. News and Updates from Khan Academy
3. Update: Streaks are going away on January 4, 2021

There are some badges before the EARTH column that are earned for getting experience points:10,000 -> Ten to the Fourth50,000 -> Benjamin Franklin100,000 -> Ten to the Fifth250,000 -> Frederick Dou...

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2. General Khan Academy Questions
3. I found out how to get atlas, tesla and artemis badges