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.
Have a single character affected by all status ailments. (both beneficial and detrimental).
View 79 Active Time Events.
Win 100 Tetra Master matches. (Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Receive 30 back attacks.
Win 10 Tetra Master matches.(Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Obtain Excalibur II.
Win with Vivi during the Festival of the Hunt.
Receive a Very Good Omen from a color fortune.
Play the blackjack minigame.
Complete FINAL FANTASY IX.
Use Blue Magic spells 100 times.
Summon Eidolons 50 times.
Use White Magic spells 200 times.
Defeat Lich, the Guardian of Earth.
Obtain the Mace of Zeus.
Defeat Kraken, the Guardian of Water.
Obtain the Rune Claws.
Defeat Tiamat, the Guardian of Wind.
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.
Use Black Magic spells 100 times.
Acquire all available support abilities.
Attain level 99 with at least one character.
Summon the eidolon Madeen.
Uncover the secret of the Eidolon Wall.
Obtain the sacred blade Excalibur.
Visit every beach in Gaia.
Synthesize 30 items.
Defeat Behemoth in the Treno weapon shop using Dagger.
Obtain the Hammer.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Cause Moguo to have a tantrum.
Purchase all items available from Stiltzkin.
Obtain 4 moonstones.
Obtain the Ultima Weapon.
Summon the eidolon Ark.
Defeat Ozma.
Obtain the Gastro Fork.
Successfully catch 99 frogs.
Successfully catch a golden frog.
Form a party with four male characters.
Summon the eidolon Odin.
Defeat 1000 enemies.
Summon the eidolon Ifrit.
Summon the eidolon Atomos.
Summon the eidolon Bahamut.
Summon the eidolon Leviathan.
Summon the eidolon Shiva.
Activate the Rebirth Flame ability when all party members are incapacitated.
Receive 10 rewards from Queen Stella.
Receive certification as a Rank S Treasure Hunter.
Gain the favor of all friendly enemies.
Locate all hidden treasures on the world map.
Obtain the complete set of Genji armor.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Obtain an airship.
Obtain the Tiger Racket.
Obtain the Whale Whisker.
Raise your chocobo's beak level to 99.
Win a Tetra Master match.
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.
Summon the eidolon Phoenix.
Summon the eidolon Carbuncle.
Summon the eidolon Ramuh.
Summon the eidolon Fenrir.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Guide all the residents of Cleyra to safety.
Enter trance 50 times.
Defeat 100 enemies.
Synthesize 10 items.
Use the Defend command 50 times.
Use the Steal command 50 times.
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.