It looks like you get those milestone days awards for our defaulted streaks of logging in and exercising. I'm not sure about the execise award, but the logging in appears to be every 25 days. I'll let our team know about that link not working.
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford
"No matter how slow you go, you are still lapping everybody on the couch."
On this page, in the introduction at the top of the page, there is a link to "milestone days" but it pops up a box saying "The requested content cannot be loaded. Please try again later." But it never works, is this an old function? I don't recall getting things like this and I was curious.