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