I have been called very successful in life: I've studied abroad a number of times, I got my college degree, I got a federal career, I bought a car with flat cash, I paid off my student loans, and I bought my own home- all before the age of 25.
But my most successful moments have been a few:
1) when I climbed up Mount Pinkuylluna in Ollantaytambo, Peru;
2) when I got to the top of Machu Picchu and looked not at the ruins, but far into the distance of the Andes, at the jagged rocks and misty jungle;
3) When I went hiking in the Dolly Sods Wilderness area for 20 miles, living out of my backpack, seeing bears and nearly falling down cliffs, and even finding live munitions from WWII (it was a testing site) it was very challenging;
4) When I went out of my comfort zone and flew to CA to be lifeguard at Disneyland. I had never thought of being in the medical field, I felt so insecure at the thought of being a LIFEGUARD ("aren't they supposed to be thin?") and I packed my bags and flew out to the other side of the country in only 1 week from deciding to accept the job, while I was still in college. That took some guts and I am so glad I did it :)))
These are all instances where I pushed myself past my limits, through my comfort zone, and into wild territory I never would have normally considered. That's my achievement.