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