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