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