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