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