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