Hi there,

The Aqualine avatar was unlocked summer 2020 due to Missions being removed from the site. To previously unlock Aqualine, you would need to master a certain number of skills in Missions, and once Missions were removed, Aqualine was unlocked to all users.

I hope this helps! Please let me know if you have any further questions.

I have a question. Why was missions removed?

Hi there,

Course mastery has become the main learning system since the removal of missions. This comment gives some insight into why missions were removed: https://support.khanacademy.org/hc/en-us/community/posts/360070675772/comments/360011217992