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