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