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