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