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