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