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