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