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