I think there are certain milestones that probably stick out more than others. Here are more of my memorable milestones.
1) Getting 100,000 points. I actually killed off my men before the level 4 elevator stage to get to the mark because I hadn't passed the elevator stage after a ton of attempts.
2) Getting past the Elevator stage. This actually took me over 60 men to acomplish. I didn't watch other at first, and so that is why it took so long. I remember hitting the elevator stage with 4 men, and knowing the odds were great I was going to lose all 4 men.
3) Getting past Donald Hayes 420,500 score. Since I consider him the greatest all around arcade player of all time it was an honor to get past him.
4) Getting to the halfway point to the killscreen
5) Getting higher than Shawn Cram's 585,700 score. He had the highest score for anyone that was a former champion of Donkey Kong 3. Being the current champion I wanted a higher score.
6) Getting past Rick Fothergill's 685,800 score. He is an all around great gamer, and has done some great things on Pac-man, Ms. Pac-man, and Jr. Pac-man. (I wonder how is he related to Mark Fothergill? are they brothers?
7)Getting to the 3/4ths way point to the killscreen
Since I just did this: Getting 327,300 on my first man. that is now higher than the 319,200 score that I had for over a year and a half, and so I see that as another milestone I accomplished.