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