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