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