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 Excalibur II.
View 79 Active Time Events.
Play the blackjack minigame.
Complete FINAL FANTASY IX.
Defeat Ozma.
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.)
Obtain the Gastro Fork.
Successfully catch 99 frogs.
Attain level 99 with at least one character.
Raise your chocobo's beak level to 99.
Activate the Rebirth Flame ability when all party members are incapacitated.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Use Blue Magic spells 100 times.
Summon Eidolons 50 times.
Acquire all available support abilities.
Uncover the secret of the Eidolon Wall.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Summon the eidolon Ark.
Synthesize 30 items.
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.
Summon the eidolon Madeen.
Gain the favor of all friendly enemies.
Obtain 4 moonstones.
Visit every beach in Gaia.
Repair the machine at Mognet Central.
Obtain the complete set of Genji armor.
Obtain the Ultima Weapon.
Obtain the Tiger Racket.
Locate all hidden treasures on the world map.
Obtain the Whale Whisker.
Summon the eidolon Phoenix.
Use White Magic spells 200 times.
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.
Summon the eidolon Bahamut.
Receive 10 rewards from Queen Stella.
Purchase all items available from Stiltzkin.
Summon the eidolon Leviathan.
Obtain an airship.
Summon the eidolon Atomos.
Summon the eidolon Carbuncle.
Summon the eidolon Odin.
Form a party with Quina Quen and three female characters.
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.
Defeat 1000 enemies.
Receive 30 back attacks.
Obtain Athlete Queen.
Use Black Magic spells 100 times.
Summon the eidolon Fenrir.
Enter trance 50 times.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Summon the eidolon Ramuh.
Synthesize 10 items.
Guide all the residents of Cleyra to safety.
Win 10 items at the Treno Auction House.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Use the Defend command 50 times.
Successfully catch a golden frog.
Win with Vivi during the Festival of the Hunt.
Receive a Very Good Omen from a color fortune.
Defeat 100 enemies.
Use the Steal command 50 times.
Cause Moguo to have a tantrum.
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.