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