Here is the full list of all 49 WORLD OF FINAL FANTASY achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Obtained every achievement.
Opened every last treasure chest.
Recorded every last Mirage in the Mirage Manual.
Fulfilled the requests of every last townsperson in need.
Defeated every last opponent in the Coliseum.
Mastered 100 Mirage Boards.
Defeated many foes using any Magitek armor.
Cleared the sky of uncountable einhänders.
Found the secret area in every dungeon.
Thwacked a whole bunch of cactuars in a single thrashing.
Defeated the Cogna known as XG.
Defeated every last murkrift Mirage.
Reached the final chamber of the Nether Nebula in record time.
Defeated the Undead Princess 10 times.
Opened 100 treasure chests.
Recorded an inconceivable number of Mirages in the Mirage Manual.
Defeated the Princess Goblin with the Warrior of Light.
Defeated the Quacho Queen with one of Lann’s attacks.
Braved and completed the new dungeons that appeared.
Battled 500 times.
Reached the true ending.
Completed every last intervention battle.
Joined forces with Shivalry to defeat the Golden Flan.
Defeated Ultros in Tometown.
Chastised the fugitive Ifreeta.
Completed 30 intervention battles.
Teamed up with Gilgamesh to stop the Bahamutian soldier.
Added Tamamohimé to your roster.
Defeated 30 teams at the Coliseum.
Brought all seven of the Pleiad back in line.
Reached an ending.
Learned the location of Castle Exnine.
Obtained every last Champion Medal.
Recorded a huge number of Mirages in the Mirage Manual.
Found all of the keys from the Crimson Prophecy.
Completed 10 intervention battles.
Obtained your first Champion Medal.
Got to the bottom of the “phenomenon” at the Coliseum.
Found the first key from the Crimson Prophecy.
Recorded a large number of Mirages in the Mirage Manual.
Battled 100 times.
Fulfilled a townsperson’s request for the first time.
Mastered your first Mirage Board.
Won your first Coliseum battle.
Completed your first intervention battle.
Defeated your first murkrift Mirage.
Repelled the Bahamutian Army.
Imprismed your first Mirage.
Arrived in Grymoire.