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