I haven't reached my first milestone yet, but I will in about a weeks (I hope XD), which would be introducing all characters of the main cast (all together 9, incl a cat and two kids). Sadly the strip with the last character won't be published until September (I produce several month ahead of time), but I'm really excited about his appearance. X3
The next milestone after that would be gathering a whole years worth of daily comics (300+ strips, no Sundays tho)
I think I put the bar a bit too high because it feels like it's taking forever to archive those milestones. But it's a great feeling to have them in arms reach x3