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