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