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