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