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