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.
Receive certification as a Rank S Treasure Hunter.
Successfully catch a golden frog.
View 79 Active Time Events.
Beat the Nero Brothers' shuffling game nine times in a row.
Obtain Athlete Queen.
Obtain Madain's Ring via mining.
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 Kain's Lance.
Obtain the Tower.
Form a party with Quina Quen and three female characters.
Activate the Rebirth Flame ability when all party members are incapacitated.
Summon the eidolon Ark.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Defeat Behemoth in the Treno weapon shop using Dagger.
Obtain the sacred blade Excalibur.
Summon the eidolon Madeen.
Obtain the Hammer.
Defeat Ozma.
Uncover the secret of the Eidolon Wall.
Gain the favor of all friendly enemies.
Obtain 4 moonstones.
Acquire all available support abilities.
Visit every beach in Gaia.
Obtain the complete set of Genji armor.
Obtain the Ultima Weapon.
Locate all hidden treasures on the world map.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Purchase all items available from Stiltzkin.
Win 100 Tetra Master matches. (Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Obtain the Whale Whisker.
Obtain the Tiger Racket.
Raise your chocobo's beak level to 99.
Summon the eidolon Bahamut.
Summon the eidolon Leviathan.
Summon the eidolon Atomos.
Attain level 99 with at least one character.
Synthesize 30 items.
Summon the eidolon Odin.
Defeat 10000 enemies.
Summon the eidolon Ifrit.
Defeat 1000 enemies.
Summon Eidolons 50 times.
Use White Magic spells 200 times.
Use Blue Magic spells 100 times.
Use Black Magic spells 100 times.
Summon the eidolon Shiva.
Receive 10 rewards from Queen Stella.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Obtain an airship.
Receive 30 back attacks.
Summon the eidolon Carbuncle.
Form a party with four male characters.
Obtain a miniature copy of the Prima Vista.
Summon the eidolon Phoenix.
Summon the eidolon Fenrir.
Free Kuppo from a wall in Fossil Roo.
Summon the eidolon Ramuh.
Synthesize 10 items.
Guide all the residents of Cleyra to safety.
Win 10 items at the Treno Auction House.
Use the Defend command 50 times.
Use the Steal command 50 times.
Cause Moguo to have a tantrum.
Obtain the Gastro Fork.
Successfully catch 99 frogs.
Win with Vivi during the Festival of the Hunt.
Enter trance 50 times.
Receive a Very Good Omen from a color fortune.
Defeat 100 enemies.
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.