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