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.
Attain level 99 with at least one character.
Enter trance 50 times.
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.
Raise your chocobo's beak level to 99.
Use Blue Magic spells 100 times.
Acquire all available support abilities.
Summon Eidolons 50 times.
Receive 30 back attacks.
Use White Magic spells 200 times.
Summon the eidolon Ark.
Have a single character affected by all status ailments. (both beneficial and detrimental).
Defeat 1000 enemies.
Defeat Ozma.
Activate the Rebirth Flame ability when all party members are incapacitated.
Synthesize 30 items.
Obtain the sacred blade Excalibur.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
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.
Summon the eidolon Shiva.
Gain the favor of all friendly enemies.
Visit every beach in Gaia.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Obtain the Ultima Weapon.
Receive a Very Good Omen from a color fortune.
Form a party with four male characters.
Uncover the secret of the Eidolon Wall.
Obtain the Hammer.
Receive 10 rewards from Queen Stella.
Defeat Behemoth in the Treno weapon shop using Dagger.
Purchase all items available from Stiltzkin.
Obtain 4 moonstones.
View 79 Active Time Events.
Summon the eidolon Madeen.
Obtain the Gastro Fork.
Summon the eidolon Bahamut.
Successfully catch 99 frogs.
Summon the eidolon Ifrit.
Summon the eidolon Leviathan.
Summon the eidolon Odin.
Summon the eidolon Atomos.
Receive certification as a Rank S Treasure Hunter.
Win 10 items at the Treno Auction House.
Locate all hidden treasures on the world map.
Obtain the complete set of Genji armor.
Obtain an airship.
Summon the eidolon Phoenix.
Summon the eidolon Carbuncle.
Obtain the Tiger Racket.
Obtain the Whale Whisker.
Cause Moguo to have a tantrum.
Obtain a miniature copy of the Prima Vista.
Beat the Nero Brothers' shuffling game nine times in a row.
Obtain Athlete Queen.
Use the Defend command 50 times.
Use Black Magic spells 100 times.
Summon the eidolon Fenrir.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Summon the eidolon Ramuh.
Synthesize 10 items.
Guide all the residents of Cleyra to safety.
Win 10 Tetra Master matches.(Certain NPCs can be re-challenged to increase your win count after progressing through the game.)
Use the Steal command 50 times.
Defeat 100 enemies.
Successfully catch a golden frog.
Win with Vivi during the Festival of the Hunt.
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.