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