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