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