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.
Jump rope 100 times without tripping.
Use Blue Magic spells 100 times.
Form a party with Quina Quen and three female characters.
Synthesize 30 items.
Summon Eidolons 50 times.
Defeat 1000 enemies.
Defeat 10000 enemies.
Purchase all items available from Stiltzkin.
Acquire all available support abilities.
Uncover the secret of the Eidolon Wall.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Successfully catch 99 frogs.
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.
Receive certification as a Rank S Treasure Hunter.
Jump rope 1000 times without tripping and obtain King of Jump Rope.
Attain level 99 with at least one character.
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.)
Receive 30 back attacks.
Use the Defend command 50 times.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Activate the Rebirth Flame ability when all party members are incapacitated.
Summon the eidolon Shiva.
Summon the eidolon Ifrit.
Summon the eidolon Ramuh.
Summon the eidolon Atomos.
Summon the eidolon Odin.
Summon the eidolon Leviathan.
Summon the eidolon Bahamut.
Summon the eidolon Ark.
Summon the eidolon Carbuncle.
Summon the eidolon Phoenix.
Summon the eidolon Madeen.
View 79 Active Time Events.
Obtain 4 moonstones.
Obtain the Gastro Fork.
Synthesize 10 items.
Play the blackjack minigame.
Complete FINAL FANTASY IX.
Obtain Excalibur II.
Defeat Lich, the Guardian of Earth.
Obtain the Mace of Zeus.
Defeat Kraken, the Guardian of Water.
Enter trance 50 times.
Use White Magic spells 200 times.
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.
Defeat Behemoth in the Treno weapon shop using Dagger.
Obtain the Hammer.
Receive 10 rewards from Queen Stella.
Visit every beach in Gaia.
Obtain the complete set of Genji armor.
Obtain the Ultima Weapon.
Obtain the Tiger Racket.
Locate all hidden treasures on the world map.
Raise your chocobo's beak level to 99.
Obtain the Whale Whisker.
Cause Moguo to have a tantrum.
Form a party with four male characters.
Obtain an airship.
Obtain a miniature copy of the Prima Vista.
Beat the Nero Brothers' shuffling game nine times in a row.
Obtain Athlete Queen.
Use Black Magic spells 100 times.
Summon the eidolon Fenrir.
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.
Win a Tetra Master match.