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