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.
Mastered 100 Mirage Boards.
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.
Cleared the sky of uncountable einhänders.
Defeated the Princess Goblin with the Warrior of Light.
Defeated the Undead Princess 10 times.
Opened every last treasure chest.
Defeated the Quacho Queen with one of Lann’s attacks.
Recorded every last Mirage in the Mirage Manual.
Fulfilled the requests of every last townsperson in need.
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.
Reached the true ending.
Completed every last intervention battle.
Added Tamamohimé to your roster.
Joined forces with Shivalry to defeat the Golden Flan.
Brought all seven of the Pleiad back in line.
Reached an ending.
Obtained every last Champion Medal.
Recorded an inconceivable number of Mirages in the Mirage Manual.
Defeated Ultros in Tometown.
Chastised the fugitive Ifreeta.
Completed 30 intervention battles.
Defeated every last murkrift Mirage.
Learned the location of Castle Exnine.
Teamed up with Gilgamesh to stop the Bahamutian soldier.
Mastered your first Mirage Board.
Found all of the keys from the Crimson Prophecy.
Recorded a huge number of Mirages in the Mirage Manual.
Completed 10 intervention battles.
Opened 100 treasure chests.
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.
Defeated 30 teams at the Coliseum.
Completed your first intervention battle.
Obtained your first Champion Medal.
Fulfilled a townsperson’s request for the first time.
Battled 500 times.
Defeated your first murkrift Mirage.
Won your first Coliseum battle.
Battled 100 times.
Repelled the Bahamutian Army.
Imprismed your first Mirage.
Arrived in Grymoire.