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.
Complete FINAL FANTASY IX.
Summon Eidolons 50 times.
Summon the eidolon Ark.
Obtain Excalibur II.
Defeat Lich, the Guardian of Earth.
Obtain the Mace of Zeus.
Defeat Kraken, the Guardian of Water.
Summon the eidolon Leviathan.
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 Atomos.
Cause Moguo to have a tantrum.
Win 10 items at the Treno Auction House.
Gain the favor of all friendly enemies.
Jump rope 1000 times without tripping and obtain King of Jump Rope.
Attain level 99 with at least one character.
Uncover the secret of the Eidolon Wall.
Summon the eidolon Madeen.
Obtain 4 moonstones.
Repair the machine at Mognet Central.
Obtain a bottle of Superslick.
Defeat Behemoth in the Treno weapon shop using Dagger.
Summon the eidolon Odin.
Obtain the Hammer.
Obtain the sacred blade Excalibur.
Receive certification as a Rank S Treasure Hunter.
Receive 10 rewards from Queen Stella.
Obtain the Tiger Racket.
Purchase all items available from Stiltzkin.
Obtain the Ultima Weapon.
View 79 Active Time Events.
Summon the eidolon Phoenix.
Summon the eidolon Bahamut.
Summon the eidolon Ifrit.
Summon the eidolon Shiva.
Locate all hidden treasures on the world map.
Obtain the complete set of Genji armor.
Obtain an airship.
Summon the eidolon Carbuncle.
Obtain the Whale Whisker.
Form a party with four male characters.
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.
Use the Defend command 50 times.
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.
Guide all the residents of Cleyra to safety.
Use Black Magic spells 100 times.
Defeat 100 enemies.
Successfully catch a golden frog.
Win with Vivi during the Festival of the Hunt.
Receive a Very Good Omen from a color fortune.
Use the Steal command 50 times.
Enter Trance for the first time.
Have the nobles demand an encore.
Jump rope 100 times without tripping.
Synthesize 30 items.
Use White Magic spells 200 times.
Use Blue Magic spells 100 times.
Defeat 1000 enemies.
Defeat 10000 enemies.
Acquire all available support abilities.
Raise your chocobo's beak level to 99.
Visit every beach in Gaia.
Successfully catch 99 frogs.
Correctly answer all the questions in Ragtime Mouse's pop quiz.
Defeat Ozma.
Play the blackjack minigame.
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).
Enter trance 50 times.
Activate the Rebirth Flame ability when all party members are incapacitated.
Obtain the Gastro Fork.