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