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