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