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I completed this last Sunday, but no achievement has unlocked yet :( I was so motivated to do this, went walking from the office at lunch time as well :)

Any idea why it's not unlocked?

Dave
Same issue. I just completed it and it hasn't unlocked for me either.
 
I got the challenge earlier this month but had to restore my phone today and now it's gone. Still shows my perfect streak in the app though. Also my thanksgiving 5k pin is there but doesn't enlarge when I tap it.
 
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