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