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My greatest achievement is developing a mindset in which achievements are understood as a construct, not a real thing.
In other words, achievements are what you make of them. In my way of thinking, there are no "real" achievements. I.e. Finishing school isn't an achievement unless you set out a goal in advance to achieve it.
I was just thinking like a cool art piece you're proud of or something man ;w;
I won a Link achievement award at school. Link booksellers was the sponsor and I got $250 to spend at their store. I can't remember what the achievement actually was though :)