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