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