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