I know people say that it's easy once you have a strategy down, but for someone like me who was able to do it at the age of twelve, it was definitely beating Ruby and Emerald Weapons (and being able to prepare myself adequately for the battles, like getting a gold chocobo, KOTR, the ultimate weapons, linking up my materia in a sophisticated enough way, etc.). It's probably my proudest achievement throughout the entire series.

I can't say I'm very proud of getting Lionheart on disc one of FFVIII. That one was out of sheer summer boredom.