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.
Obtain Excalibur II.
Defeat 10000 enemies.
Use Blue Magic spells 100 times.
Have a single character affected by all status ailments. (both beneficial and detrimental).
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.
Acquire all available support abilities.
Defeat Behemoth in the Treno weapon shop using Dagger.
Use White Magic spells 200 times.
Uncover the secret of the Eidolon Wall.
Cause Moguo to have a tantrum.
Activate the Rebirth Flame ability when all party members are incapacitated.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Gain the favor of all friendly enemies.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Visit every beach in Gaia.
Obtain the Ultima Weapon.
Obtain the Tiger Racket.
Summon the eidolon Ark.
Defeat Ozma.
Locate all hidden treasures on the world map.
Raise your chocobo's beak level to 99.
Obtain the Whale Whisker.
Obtain the sacred blade Excalibur.
Receive certification as a Rank S Treasure Hunter.
Obtain the Hammer.
Receive 10 rewards from Queen Stella.
Purchase all items available from Stiltzkin.
Obtain 4 moonstones.
Play the blackjack minigame.
Complete FINAL FANTASY IX.
Summon Eidolons 50 times.
Defeat Lich, the Guardian of Earth.
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.
Form a party with Quina Quen and three female characters.
View 79 Active Time Events.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Summon the eidolon Bahamut.
Summon the eidolon Madeen.
Obtain an airship.
Summon the eidolon Leviathan.
Summon the eidolon Atomos.
Summon the eidolon Odin.
Defeat 1000 enemies.
Form a party with four male characters.
Obtain a miniature copy of the Prima Vista.
Synthesize 30 items.
Receive 30 back attacks.
Beat the Nero Brothers' shuffling game nine times in a row.
Obtain Athlete Queen.
Summon the eidolon Carbuncle.
Summon the eidolon Phoenix.
Summon the eidolon Fenrir.
Synthesize 10 items.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Summon the eidolon Ramuh.
Use Black Magic spells 100 times.
Enter trance 50 times.
Win 10 items at the Treno Auction House.
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.
Attain level 99 with at least one character.
Guide all the residents of Cleyra to safety.
Successfully catch a golden frog.
Use the Defend command 50 times.
Use the Steal command 50 times.
Defeat 100 enemies.
Enter Trance for the first time.
Have the nobles demand an encore.
Win a Tetra Master match.