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