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