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