I regret:

- never getting the 5 chest run in CC
- not getting my last class to 50 before the end of 1.0
- not playing through all the old class-quests (NOT AF quests!)
- not getting Garuda BLM staff before the end of 1.0
- not getting the imperial hats

My RL schedule was like REALLY full the last couple of weeks so I only started actively playing again last weekend....when my internet connection broke down T_T
Speedrun achievement, old classquests and hats hurt the most though because I can't get or see them anymore in 2.0