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