So last night in my playthrough of FFI, I was finally able to cross off something I've wanted to do for ages in the game, and that was take on Warmech and win. So last night, my Master Monk and Black Wizard squeaked by and survived the ordeal. I hope to complete my next thing I've always wanted to do, which was beat the NES version of Final Fantasy I. So this thread is about things you've been meaning to do in an FF game.

FFI:
Beat the NES version
Get to Lv. 50 in NES version
Do the White Mage challenge

FFII:
Play the original Famicom version
Get Ultima maxed out
Fight and Win against the Iron Giant

FFIII:
Play the original Famicom version
Beat the Original Famicom version without Sage/Ninja party or FEOK
Obtain FEOK
Unlock all the side content on the DS version of the game
Beat Iron Giant (DS)
Get Lv. 99 for every Job class for every character (DS)

FFIV:
Get Adamant Armor
Get to Level 99 with my final party (SNES/PSX/Super Famicom)
Obtain all equipment and items (PSX/Super Famicom)
Obtain all Onion Gear in FFIVDS
Beat Geyon and Proto-Babil (DS)
Finish The After Years

FFV:
Get my party to Lv. 99
Do a No Job Class challenge
Do a Low Level No Job Class Challenge

FFVI:
Do a CES Challenge
Do a Natural Magic/ No Esper challenge
See all ending variations
Beat Kefka with an Imp party
Do a low levels natural magic CES challenge

FFVII:
Obtain the Parasol without cheats/rapid fire controller
Obtain all equipment/Materia
Get a complete set of master materia for every character
Do a No Materia Challenge

FFVIII:
Obtain every Triple Triad card
Get 100 Ultima/Flare/Holy/Meteor for every character
Obtain every blue magic
Play Chocobo's World
Master Armageddon Fist

FFIX:
See the different ending variation
Get every Tetra Master card
Get Excalibur 2
Get Everyone to Lv. 99

FFX:
Complete the Sphere Grid for every character
Complete and beat the Monster Arena
Get all of the Celestial Weapons
Learn not to slam my head in a wall every time Yuna says or does something stupid
Get 100% on FFX-2

FFXI:
Finish the storyline someday

FFXII:
Obtain every piece of equipment
Beat Omega Weapon Mk.XII
Get everyone to Level 99
Obtain a second Zodiac Spear
Play the International Version
Finish Revenant Wings

FFXIII:
Get every Trophy/Achievement
Never play it again

Final Fantasy Tactics:
Get every item/equipment
Get a full roster of level 99 characters with all jobs max out (Including story characters)

Tactics Advance and TA2:
Same as Tactics
Complete all Missions

Mystic Quest:
Finish it

Dissidia and Duodecim:
Get 100% Completion
Finish those missions I was designing.