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