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