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