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