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 10000 enemies.
Summon the eidolon Ark.
Defeat Ozma.
Attain level 99 with at least one character.
Uncover the secret of the Eidolon Wall.
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.
Obtain Kain's Lance.
Form a party with Quina Quen and three female characters.
Obtain the Gastro Fork.
Successfully catch 99 frogs.
Activate the Rebirth Flame ability when all party members are incapacitated.
Defeat 1000 enemies.
Acquire all available support abilities.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Gain the favor of all friendly enemies.
Obtain 4 moonstones.
Receive 30 back attacks.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Visit every beach in Gaia.
Obtain the Ultima Weapon.
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.
Purchase all items available from Stiltzkin.
View 79 Active Time Events.
Summon Eidolons 50 times.
Use White Magic spells 200 times.
Summon the eidolon Madeen.
Summon the eidolon Bahamut.
Receive 10 rewards from Queen Stella.
Obtain the complete set of Genji armor.
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 an airship.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Form a party with four male characters.
Summon the eidolon Odin.
Summon the eidolon Leviathan.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Summon the eidolon Atomos.
Win 10 items at the Treno Auction House.
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 Carbuncle.
Enter trance 50 times.
Summon the eidolon Fenrir.
Use Blue Magic spells 100 times.
Synthesize 30 items.
Synthesize 10 items.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Summon the eidolon Ramuh.
Guide all the residents of Cleyra to safety.
Use Black Magic spells 100 times.
Use the Defend command 50 times.
Defeat 100 enemies.
Successfully catch a golden frog.
Win with Vivi during the Festival of the Hunt.
Receive a Very Good Omen from a color fortune.
Use the Steal command 50 times.
Cause Moguo to have a tantrum.
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.