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