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