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