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