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