Lowest activity to become a legendary is 775 activity and there's at least 1 user who became legendary with only 775 activity.
Here's a post by theymos back in 2015.
Here are the luckiest and unluckiest Legendaries so far:
+-----------------------------------------+--------+
| realName | alimit |
+-----------------------------------------+--------+
| ajareselde | 780 |
+-----------------------------------------+--------+
Thanks for the info list, guess i forgot that i was pretty lucky as well to reach legendary at just 780 activity points, but then again; it's not as nearly as
interesting like it was when the membership was introduced because there's a ton of legendaries now :/
Congrats on the rank, welcome to the club.
Didn't realize how many got this status below the 800 mark.
I guess I was just a late bloomer.
But i will uphold the prestige of it by making a
positive difference for the good instead of letting things just go too far. That is just a path for disaster as my grand father use to say. And I am beginning to see that he was right.
Thanks for the welcome Ajareselde!