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