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