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