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