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