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