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