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