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