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