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