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