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