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.
Synthesize 30 items.
Use Blue Magic spells 100 times.
Acquire all available support abilities.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Gain the favor of all friendly enemies.
Complete FINAL FANTASY IX.
Play the blackjack minigame.
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).
Summon the eidolon Phoenix.
Obtain 4 moonstones.
Uncover the secret of the Eidolon Wall.
Visit every beach in Gaia.
Win 10 Tetra Master matches.(Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Repair the machine at Mognet Central.
Defeat Ozma.
Activate the Rebirth Flame ability when all party members are incapacitated.
Raise your chocobo's beak level to 99.
Locate all hidden treasures on the world map.
Obtain the Whale Whisker.
Obtain a bottle of Superslick.
Receive certification as a Rank S Treasure Hunter.
Obtain the Hammer.
Defeat Behemoth in the Treno weapon shop using Dagger.
Receive 10 rewards from Queen Stella.
Purchase all items available from Stiltzkin.
Cause Moguo to have a tantrum.
Defeat 10000 enemies.
Summon Eidolons 50 times.
Use White Magic spells 200 times.
Receive 30 back attacks.
Defeat 1000 enemies.
Use Black Magic spells 100 times.
Obtain Excalibur II.
Defeat Lich, the Guardian of Earth.
Obtain the complete set of Genji armor.
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.
Enter trance 50 times.
Obtain the Tower.
Use the Steal command 50 times.
View 79 Active Time Events.
Use the Defend command 50 times.
Obtain an airship.
Summon the eidolon Leviathan.
Obtain Kain's Lance.
Form a party with Quina Quen and three female characters.
Form a party with four male characters.
Obtain the sacred blade Excalibur.
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 Madeen.
Summon the eidolon Carbuncle.
Summon the eidolon Fenrir.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Summon the eidolon Ramuh.
Synthesize 10 items.
Obtain the Tiger Racket.
Obtain the Ultima Weapon.
Summon the eidolon Atomos.
Summon the eidolon Odin.
Attain level 99 with at least one character.
Guide all the residents of Cleyra to safety.
Defeat 100 enemies.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Win 10 items at the Treno Auction House.
Summon the eidolon Bahamut.
Obtain the Gastro Fork.
Successfully catch 99 frogs.
Successfully catch a golden frog.
Win with Vivi during the Festival of the Hunt.
Win a Tetra Master match.
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.