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