Yes, you do have to get 100% for the Perfect Ending. Its about to be my 6th time beating the game and I finally got 100 precent. Youth Leauge, Rikku or Chocobo Eater culprit, get episode complete in almost everything. Yada yada yada. The first time it was 92, then 94, then 96, then 98, then my cousin with 95, and now, 100%. I am one happy customer. My mom needs help, so when she plays, it'll be my 7th time! Hurray! But I play FFX a lot more than that, though. Lol.