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.
Defeat 10000 enemies.
Receive 30 back attacks.
Defeat 1000 enemies.
Play the blackjack minigame.
Complete FINAL FANTASY IX.
Attain level 99 with at least one character.
Defeat Lich, the Guardian of Earth.
Win 100 Tetra Master matches. (Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
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.
Form a party with Quina Quen and three female characters.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Win 10 Tetra Master matches.(Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Uncover the secret of the Eidolon Wall.
Win 10 items at the Treno Auction House.
Use White Magic spells 200 times.
Obtain the Gastro Fork.
Use Blue Magic spells 100 times.
Summon the eidolon Ark.
Successfully catch 99 frogs.
Defeat Ozma.
Activate the Rebirth Flame ability when all party members are incapacitated.
Use the Defend command 50 times.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Gain the favor of all friendly enemies.
Summon the eidolon Madeen.
Acquire all available support abilities.
Summon Eidolons 50 times.
Summon the eidolon Ifrit.
Summon the eidolon Bahamut.
Enter trance 50 times.
Obtain 4 moonstones.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Visit every beach in Gaia.
Obtain the sacred blade Excalibur.
Obtain the Hammer.
Defeat Behemoth in the Treno weapon shop using Dagger.
Receive 10 rewards from Queen Stella.
Purchase all items available from Stiltzkin.
Obtain the Ultima Weapon.
View 79 Active Time Events.
Summon the eidolon Leviathan.
Summon the eidolon Atomos.
Summon the eidolon Odin.
Summon the eidolon Shiva.
Receive certification as a Rank S Treasure Hunter.
Obtain the Tiger Racket.
Obtain the complete set of Genji armor.
Locate all hidden treasures on the world map.
Raise your chocobo's beak level to 99.
Obtain the Whale Whisker.
Obtain an airship.
Summon the eidolon Carbuncle.
Form a party with four male characters.
Obtain a miniature copy of the Prima Vista.
Beat the Nero Brothers' shuffling game nine times in a row.
Synthesize 30 items.
Obtain Athlete Queen.
Summon the eidolon Phoenix.
Use Black Magic spells 100 times.
Summon the eidolon Fenrir.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Summon the eidolon Ramuh.
Guide all the residents of Cleyra to safety.
Defeat 100 enemies.
Use the Steal command 50 times.
Successfully catch a golden frog.
Win with Vivi during the Festival of the Hunt.
Synthesize 10 items.
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.