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