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