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