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