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