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