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