Included below is a full list of the side quests that can be completed in the game, however the top link can be used as a guide for completing all of the end game content available in the game. This page provides you with step-by-step instructions for which quests to complete and in which order:
The full list of side quests is included below:
O’aka XXIII
Information on O’aka XXIII, the traveling merchant extraordinaire, who follows your team around Spira and sells you items when you need them.
Sphere Theater
Visiting the Sphere Theater in Luca to watch "Movie Spheres" of cutscenes from the game or to listen to “Music Spheres” which are soundtracks from throughout the game.
Chocobo Training
Completing the Chocobo Training side quests either as you pass through the Calm Lands the first time or returning later on in the game.
Celestial Mirror
Obtaining the Celestial Mirror which is the first step to obtaining the Celestial Weapons.
Airship Passwords & Hidden Coordinates
A list of the Al Bhed passwords and search coordinates for exploring Spira from the airship destination list.
Baaj Temple
Complete Baaj Temple to obtain Anima, one of the unlockable Aeons.
Cavern of the Stolen Fayth
This side quest can be completed as soon as you reach the Calm Lands and is where you obtain the optional Aeon Yojimbo.
Remiem Temple
Obtain the Celestial Mirror and battle all of Belgemine’s Aeons to receive the Moon Sigil required for Yuna’s Celestial Weapon, Nirvana.
Aeons
Obtain all three of the optional and secret Aeons in the game (Yojimbo, Anima and Magus Sisters).
Jecht Spheres
Obtaining the Jecht Spheres and Braska Spheres as you travel through the game in order to obtain Auron’s Overdrives.
Al Bhed Primer Locations
Make sure that you picked up all of the Al Bhed Primers scattered throughout Spira. Note that you may not be able to return to certain areas of the game to retrieve some if you missed them.
Village of the Cactuars
Complete the Cactuar Village side quest to obtain the Mercury Sigil, one of the pieces of Rikku’s Celestial Weapon, Godhand.
Butterfly Catcher
Catching blue butterflies in Macalania Woods in order to obtain the Saturn Sigil for Kimahri’s Celestial Weapon, Spirit Lance.
Lightning Dodger
Tips and tactics for dodging lightning strikes in the Thunder Plains in order to obtain the Venus Sigil for Lulu’s Celestial Weapon, Onion Knight.
Celestial Weapons
Information on how to obtain all of the Celestial Weapons for each of your characters.
Omega Ruins
Battle against some of the strongest fiends and bosses in the game.
Nemesis
Battling the superboss, Nemesis, the most difficult “Original” creation fiend available in the Monster Arena.
Dark Aeons
Traveling through Spira and battling each of the Dark Aeons that appear.
Penance
The battle against the strongest superboss in the game.
