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