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