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