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