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