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