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