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