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