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