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