Full list of all 35 Final Fantasy XIII achievements worth 1,000 gamerscore. It takes around 80-100 hours to unlock all of the achievements on Xbox 360.
Earned a 5-star rating for all Cie'th Stone missions.
Felled a heavyweight of the lowerworld wilds.
Completed all Cie'th Stone missions.
Completed all mid-level Cie'th Stone missions.
Completed all high-level Cie'th Stone missions.
Held every weapon and accessory.
Triumphed over undying lowerworld souls in seven fierce battles.
Passed Titan's trials.
Toppled a green terror and cut an oversized succulent down to size.
Fully developed all characters.
Mastered the Medic role.
Mastered the Synergist role.
Mastered the Saboteur role.
Mastered the Sentinel role.
Mastered the Ravager role.
Mastered the Commando role.
Took over 10,000 steps on the lowerworld surface.
Discovered buried treasure with a little help from a chocobo.
Completed all low-level Cie'th Stone missions.
Witnessed the dawn of a new crystal legend.
Earned a 5-star rating in the battle to determine the world's fate.
Dealt 100,000+ damage with a single attack.
Defied destiny's charge and embarked on a different path.
Traveled to the world below, seeking a way to alter fate.
Discerned the full attributes of 100 enemies.
Recognized the true threat to the world's future.
Strode into danger's den and paid the consequences.
Slipped through the net and lived to fight another day.
Resolved to be more than a victim of circumstance.
Evaded pursuers, though memories of the past still gave chase.
Carried the burden of guilt to the end of the line.
Took the fight to the enemy's door.
Made plans to infiltrate enemy-occupied territory.
Survived the Purge to confront a greater peril.
Took the first steps toward challenging an unjust fate.