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.
Win 10 items at the Treno Auction House.
Attain level 99 with at least one character.
Win 10 Tetra Master matches.(Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Cause Moguo to have a tantrum.
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.
Summon the eidolon Bahamut.
View 79 Active Time Events.
Summon the eidolon Phoenix.
Obtain an airship.
Use White Magic spells 200 times.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Summon the eidolon Leviathan.
Summon the eidolon Atomos.
Obtain a miniature copy of the Prima Vista.
Obtain Athlete Queen.
Summon the eidolon Carbuncle.
Summon the eidolon Fenrir.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Summon the eidolon Ramuh.
Successfully catch a golden frog.
Jump rope 1000 times without tripping and obtain King of Jump Rope.
Guide all the residents of Cleyra to safety.
Use Black Magic spells 100 times.
Use the Defend command 50 times.
Synthesize 10 items.
Defeat 100 enemies.
Win with Vivi during the Festival of the Hunt.
Receive a Very Good Omen from a color fortune.
Use the Steal command 50 times.
Jump rope 100 times without tripping.
Enter Trance for the first time.
Have the nobles demand an encore.
Win a Tetra Master match.
Synthesize 30 items.
Use Blue Magic spells 100 times.
Summon Eidolons 50 times.
Defeat 1000 enemies.
Defeat 10000 enemies.
Purchase all items available from Stiltzkin.
Acquire all available support abilities.
Uncover the secret of the Eidolon Wall.
Raise your chocobo's beak level to 99.
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 99 frogs.
Obtain the sacred blade Excalibur.
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.
Complete FINAL FANTASY IX.
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.
Form a party with four male 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 Ark.
Summon the eidolon Madeen.
Obtain 4 moonstones.
Obtain the Mace of Zeus.
Obtain the Gastro Fork.
Obtain Excalibur II.
Obtain the Whale Whisker.
Obtain the Tiger Racket.
Obtain the Ultima Weapon.
Obtain the complete set of Genji armor.
Defeat Kraken, the Guardian of Water.
Defeat Lich, the Guardian of Earth.