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