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