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