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