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