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.
Defeat Ozma.
Obtain the Gastro Fork.
Successfully catch 99 frogs.
Defeat 1000 enemies.
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.)
Have a single character affected by all status ailments. (both beneficial and detrimental).
Win 10 Tetra Master matches.(Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Uncover the secret of the Eidolon Wall.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Use Blue Magic spells 100 times.
Use White Magic spells 200 times.
Summon the eidolon Ark.
Summon Eidolons 50 times.
Activate the Rebirth Flame ability when all party members are incapacitated.
Gain the favor of all friendly enemies.
Acquire all available support abilities.
Obtain 4 moonstones.
Use Black Magic spells 100 times.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Visit every beach in Gaia.
Obtain the Tiger Racket.
Locate all hidden treasures on the world map.
Raise your chocobo's beak level to 99.
Obtain the Whale Whisker.
Obtain the Ultima Weapon.
Receive certification as a Rank S Treasure Hunter.
Obtain the sacred blade Excalibur.
Defeat Behemoth in the Treno weapon shop using Dagger.
Successfully catch a golden frog.
Purchase all items available from Stiltzkin.
Play the blackjack minigame.
Complete FINAL FANTASY IX.
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 the eidolon Odin.
Defeat Tiamat, the Guardian of Wind.
Summon the eidolon Ifrit.
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.
Obtain the Hammer.
Receive 10 rewards from Queen Stella.
Form a party with four male characters.
View 79 Active Time Events.
Summon the eidolon Bahamut.
Summon the eidolon Madeen.
Summon the eidolon Phoenix.
Synthesize 30 items.
Summon the eidolon Carbuncle.
Obtain an airship.
Summon the eidolon Shiva.
Summon the eidolon Leviathan.
Summon the eidolon Atomos.
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.
Summon the eidolon Fenrir.
Summon the eidolon Ramuh.
Use the Defend command 50 times.
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.
Enter trance 50 times.
Cause Moguo to have a tantrum.
Win with Vivi during the Festival of the Hunt.
Synthesize 10 items.
Receive a Very Good Omen from a color fortune.
Enter Trance for the first time.
Use the Steal command 50 times.
Have the nobles demand an encore.
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.