Congratulations! Now the real nightmare begins.
And sticking to the question about major life acheivments, around age 16 i realized that taking things too seriously was only making me become needlessly stressed out. It didn't help that i was already 6' 3" by that age, but i looked like i was in my late 30s at that time due to sleep deprivation. At that point, i quit giving a shit. I didn't care about what my grades were, i simply treated myself to a hot dog with pickled onions, mustard, and Tabasco whenever i got all my homework for the week in, took up gaming, and discovered George Carlin. I learned to live life based on my own standards and set my own goals, and i finally grew the balls to tell my parents "Fuck you and your bible too, my morals and my creed are of my own design and if God wants to claim credit he can sue me!"
And truth be told it actually worked out. I quit struggling in school and actually got better grades when i simply was content with finishing the work, i even got into a decent college and am now a doctor with a dog and a girlfriend and a gay neighbor who never leaves me the fuck alone but who gives me video games as presents so that i don't sue him for harassment.
Life is good because i gave up 12 years ago. I quit caring. That was my major achievement, that was what allowed me to realize my potential.
