Milestones that repeat or reset on a daily basis.
Milestones that, once completed a single time, can never be repeated.
Special indicates that the event is not on a daily/weekly cadence, but does occur more than once. For instance, Iron Banner in Destiny 1 or the Dawning were examples of what could be termed "Special" events.
One-time milestones that are specifically oriented toward teaching players about new mechanics and gameplay modes.
Milestones that repeat/reset on a weekly basis. They need not all reset on the same day or time, but do need to reset weekly to qualify for this type.
The type of milestone. Milestones can be Tutorials, one-time/triggered/non- repeating but not necessarily tutorials, or Repeating Milestones.