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