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