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