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