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