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 4 moonstones.
Obtain Excalibur II.
Defeat Ozma.
Attain level 99 with at least one character.
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.
Summon the eidolon Ark.
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.
Activate the Rebirth Flame ability when all party members are incapacitated.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Have a single character affected by all status ailments. (both beneficial and detrimental).
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.)
Win 10 items at the Treno Auction House.
Uncover the secret of the Eidolon Wall.
Use Blue Magic spells 100 times.
Summon Eidolons 50 times.
Use White Magic spells 200 times.
Visit every beach in Gaia.
Acquire all available support abilities.
Use the Defend command 50 times.
Jump rope 1000 times without tripping and obtain King of Jump Rope.
Jump rope 100 times without tripping.
Purchase all items available from Stiltzkin.
Receive certification as a Rank S Treasure Hunter.
Obtain the sacred blade Excalibur.
Obtain the Hammer.
Obtain the Ultima Weapon.
Defeat Behemoth in the Treno weapon shop using Dagger.
Summon the eidolon Odin.
Receive 10 rewards from Queen Stella.
View 79 Active Time Events.
Summon the eidolon Bahamut.
Gain the favor of all friendly enemies.
Summon the eidolon Madeen.
Obtain the Gastro Fork.
Successfully catch 99 frogs.
Obtain the complete set of Genji armor.
Obtain the Tiger Racket.
Locate all hidden treasures on the world map.
Raise your chocobo's beak level to 99.
Obtain the Whale Whisker.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Form a party with four male characters.
Obtain an airship.
Summon the eidolon Leviathan.
Summon the eidolon Phoenix.
Summon the eidolon Atomos.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Defeat 1000 enemies.
Enter trance 50 times.
Obtain a miniature copy of the Prima Vista.
Beat the Nero Brothers' shuffling game nine times in a row.
Synthesize 30 items.
Obtain Athlete Queen.
Summon the eidolon Fenrir.
Summon the eidolon Carbuncle.
Use Black Magic spells 100 times.
Successfully catch a golden frog.
Obtain Madain's Ring via mining.
Free Kuppo from a wall in Fossil Roo.
Use the Steal command 50 times.
Receive 30 back attacks.
Summon the eidolon Ramuh.
Guide all the residents of Cleyra to safety.
Synthesize 10 items.
Win with Vivi during the Festival of the Hunt.
Cause Moguo to have a tantrum.
Receive a Very Good Omen from a color fortune.
Defeat 100 enemies.
Enter Trance for the first time.
Have the nobles demand an encore.
Win a Tetra Master match.