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.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Defeat 10000 enemies.
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.
Summon the eidolon Ark.
Defeat Ozma.
Attain level 99 with at least one character.
Visit every beach in Gaia.
Use Blue Magic spells 100 times.
Acquire all available support abilities.
Activate the Rebirth Flame ability when all party members are incapacitated.
Gain the favor of all friendly enemies.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Obtain 4 moonstones.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Obtain the Ultima Weapon.
Obtain the Tiger Racket.
Locate all hidden treasures on the world map.
Obtain the Whale Whisker.
Summon the eidolon Madeen.
Summon the eidolon Odin.
Form a party with four male characters.
Summon the eidolon Phoenix.
Form a party with Quina Quen and three female characters.
Raise your chocobo's beak level to 99.
Synthesize 30 items.
Synthesize 10 items.
Obtain the sacred blade Excalibur.
Receive certification as a Rank S Treasure Hunter.
Win 10 items at the Treno Auction House.
Defeat Behemoth in the Treno weapon shop using Dagger.
Obtain the Hammer.
Receive 10 rewards from Queen Stella.
Purchase all items available from Stiltzkin.
Obtain the complete set of Genji armor.
Defeat 1000 enemies.
View 79 Active Time Events.
Enter trance 50 times.
Cause Moguo to have a tantrum.
Receive 30 back attacks.
Summon the eidolon Carbuncle.
Use the Steal command 50 times.
Obtain a miniature copy of the Prima Vista.
Beat the Nero Brothers' shuffling game nine times in a row.
Obtain Athlete Queen.
Summon the eidolon Fenrir.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Win with Vivi during the Festival of the Hunt.
Receive a Very Good Omen from a color fortune.
Have the nobles demand an encore.
Jump rope 1000 times without tripping and obtain King of Jump Rope.
Jump rope 100 times without tripping.
Play the blackjack minigame.
Complete FINAL FANTASY IX.
Use White Magic spells 200 times.
Summon Eidolons 50 times.
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.
Obtain the Tower.
Defeat Maliris, the Guardian of Fire.
Obtain Kain's Lance.
Uncover the secret of the Eidolon Wall.
Use Black Magic spells 100 times.
Summon the eidolon Bahamut.
Obtain an airship.
Summon the eidolon Leviathan.
Summon the eidolon Atomos.
Summon the eidolon Shiva.
Summon the eidolon Ifrit.
Use the Defend command 50 times.
Summon the eidolon Ramuh.
Guide all the residents of Cleyra to safety.
Defeat 100 enemies.
Successfully catch a golden frog.
Win a Tetra Master match.
Enter Trance for the first time.