Here is the full list of all 40 Final Fantasy XII The Zodiac Age achievements worth 1,000 gamerscore.
Defeated the Behemoth King.
Completed the 50th trial.
Defeated Fafnir.
Defeated Carrot.
Defeated Deathgaze.
Defeated Ultima.
Defeated Zodiark.
Obtained a Morbid Urn.
Defeated the Trickster.
Spent 1,000,000 gil.
Faced Doctor Cid.
Set out from Mt Bur-Omisace.
Raised your party's average level above 50.
Earned 48,000 License Points.
Obtained 500,000 Clan Points.
Successfully stole 50 times.
Used Technicks 100 times.
Obtained the Dawn Shard.
Cast Magicks 200 times.
Rescued the Princess of Dalmasca.
Acquired 100,000 gil.
Sold 1,000 pieces of loot.
Completed a 50-chain in battle.
Escaped from the Nalbina Dungeons.
Defeated 500 foes.
Took 50,000 steps.
Used Attack 300 times.
Defeated your first mark.
Faced the Archadian Empire as an initiate in the Order of the Knights of Dalmasca.
Completed the Bestiary.
Learned every Magick.
Learned every Technick.
Fully explored every map.
Performed every Concurrence.
Defeated Gilgamesh.
Defeated Yiazmat.
Defeated the Hell Wyrm.
Obtained every Esper.
Restored peace to Ivalice.
Completed the 100th trial.