Interesting (to me) note:
If you miss an objective it will replace the "next" one in that slot. I think we all knew this.
If you do all the objectives the next day, you will be back on the same set as everyone else the following day.
Example (if you skip 7)
1, 2, 3, 4, 5, 6, 7
8, 9, 10, 11, 12, 13, 7
15, 16, 17, 18, 19, 20, 21
I would've figured you would always be "behind" one day's objectives, but it seems like it just checks each day if you completed and keeps the ones you haven't done, then gives you the new set for anything you did (or that was a double-skip).
I'm sure it's highly unlikely this will be useful for you, but it does help avoid getting your characters/mules out of sync.