My 1st is definately my Eagle -- took till I was 17 yrs & 360 days, but I earned it.
2nd -- my Zit Kala Sha OA pocket flap -- as many of you have noted, the honor that comes with just being tapped out says it all.
3rd -- the one I now wear on my left sleeve -- den leader - -I've come 3/4 circle through scouting. I went all the way from cub through Eagle, to den leader for my son & his buddies.
4th -- though not my achievement, I am extremely proud of this -- my Grandfather, Al Scherer, dedicated his life to scouting after WWII. He served for over 50 yrs as scoutmaster of Troop 190. In that time he earned the Silver Beaver, & lead over 100 boys to thier Eagle.