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