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