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 4 moonstones.
Purchase all items available from Stiltzkin.
Receive 30 back attacks.
View 79 Active Time Events.
Obtain Excalibur II.
Obtain Madain's Ring via mining.
Raise your chocobo's beak level to 99.
Win 100 Tetra Master matches. (Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Acquire all available support abilities.
Obtain the Angel Flute.
Defeat 10000 enemies.
Defeat 1000 enemies.
Play the blackjack minigame.
Complete FINAL FANTASY IX.
Defeat Lich, the Guardian of Earth.
Obtain the Mace of Zeus.
Defeat Kraken, the Guardian of Water.
Summon the eidolon Ark.
Defeat Tiamat, the Guardian of Wind.
Obtain the Rune Claws.
Defeat Maliris, the Guardian of Fire.
Obtain the Tower.
Obtain Kain's Lance.
Form a party with four male characters.
Form a party with Quina Quen and three female characters.
Attain level 99 with at least one character.
Defeat Ozma.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Visit every beach in Gaia.
Gain the favor of all friendly enemies.
Uncover the secret of the Eidolon Wall.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Obtain the Gastro Fork.
Successfully catch 99 frogs.
Receive certification as a Rank S Treasure Hunter.
Obtain the sacred blade Excalibur.
Obtain the Hammer.
Defeat Behemoth in the Treno weapon shop using Dagger.
Receive 10 rewards from Queen Stella.
Obtain the Ultima Weapon.
Activate the Rebirth Flame ability when all party members are incapacitated.
Summon Eidolons 50 times.
Use White Magic spells 200 times.
Use Blue Magic spells 100 times.
Locate all hidden treasures on the world map.
Obtain the complete set of Genji armor.
Obtain the Whale Whisker.
Jump rope 1000 times without tripping and obtain King of Jump Rope.
Jump rope 100 times without tripping.
Obtain the Tiger Racket.
Summon the eidolon Bahamut.
Summon the eidolon Madeen.
Obtain an airship.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Summon the eidolon Leviathan.
Successfully catch a golden frog.
Enter trance 50 times.
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.
Summon the eidolon Carbuncle.
Summon the eidolon Fenrir.
Summon the eidolon Phoenix.
Summon the eidolon Ramuh.
Free Kuppo from a wall in Fossil Roo.
Use Black Magic spells 100 times.
Guide all the residents of Cleyra to safety.
Summon the eidolon Atomos.
Synthesize 10 items.
Win 10 items at the Treno Auction House.
Summon the eidolon Odin.
Defeat 100 enemies.
Use the Steal command 50 times.
Win with Vivi during the Festival of the Hunt.
Receive a Very Good Omen from a color fortune.
Cause Moguo to have a tantrum.
Enter Trance for the first time.
Use the Defend command 50 times.
Have the nobles demand an encore.
Win 10 Tetra Master matches.(Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Win a Tetra Master match.