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