Here is the full list of all 85 Final Fantasy IX achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Complete FINAL FANTASY IX.
Defeat Ozma.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Attain level 99 with at least one character.
Activate the Rebirth Flame ability when all party members are incapacitated.
Acquire all available support abilities.
Defeat Lich, the Guardian of Earth.
Obtain the Mace of Zeus.
Defeat Kraken, the Guardian of Water.
Summon the eidolon Ark.
Summon Eidolons 50 times.
Defeat Tiamat, the Guardian of Wind.
Summon the eidolon Madeen.
Obtain the Rune Claws.
Form a party with four male characters.
Form a party with Quina Quen and three female characters.
Obtain the Angel Flute.
Defeat Maliris, the Guardian of Fire.
Obtain the Tower.
Obtain Kain's Lance.
Uncover the secret of the Eidolon Wall.
Obtain the sacred blade Excalibur.
Visit every beach in Gaia.
Defeat Behemoth in the Treno weapon shop using Dagger.
Obtain the Hammer.
Receive 10 rewards from Queen Stella.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Purchase all items available from Stiltzkin.
Obtain 4 moonstones.
Obtain the Ultima Weapon.
Use Blue Magic spells 100 times.
Use Black Magic spells 100 times.
Defeat 1000 enemies.
Receive 30 back attacks.
Summon the eidolon Odin.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Obtain the Gastro Fork.
Use White Magic spells 200 times.
Successfully catch 99 frogs.
Summon the eidolon Bahamut.
Summon the eidolon Leviathan.
Summon the eidolon Atomos.
Receive certification as a Rank S Treasure Hunter.
Locate all hidden treasures on the world map.
Gain the favor of all friendly enemies.
Obtain the complete set of Genji armor.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Obtain an airship.
Summon the eidolon Phoenix.
Summon the eidolon Carbuncle.
Obtain the Tiger Racket.
Obtain the Whale Whisker.
Cause Moguo to have a tantrum.
Win 10 items at the Treno Auction House.
Synthesize 30 items.
Obtain a miniature copy of the Prima Vista.
Obtain Athlete Queen.
Summon the eidolon Ramuh.
Summon the eidolon Fenrir.
Enter trance 50 times.
Free Kuppo from a wall in Fossil Roo.
Successfully catch a golden frog.
Guide all the residents of Cleyra to safety.
Win a Tetra Master match.
Use the Defend command 50 times.
Defeat 100 enemies.
Synthesize 10 items.
Receive a Very Good Omen from a color fortune.
Use the Steal command 50 times.
Enter Trance for the first time.
Have the nobles demand an encore.
Defeat 10000 enemies.
Raise your chocobo's beak level to 99.
Jump rope 1000 times without tripping and obtain King of Jump Rope.
Jump rope 100 times without tripping.
Win with Vivi during the Festival of the Hunt.
Obtain Madain's Ring via mining.
Beat the Nero Brothers' shuffling game nine times in a row.
Play the blackjack minigame.
Win 10 Tetra Master matches.(Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Win 100 Tetra Master matches. (Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
View 79 Active Time Events.
Obtain Excalibur II.