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