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