Here is the full list of all 29 LEGO Star Wars II: The Original Trilogy achievements worth 1,000 gamerscore.
Complete all levels of Episode V in Story mode.
Complete 40% of the game.
Complete all levels of Episode VI in Story mode.
Complete 20% of the game.
Complete all levels of Episode IV in Story mode.
Complete Secret Plans, the first level of Episode IV
Complete the LEGO City level.
Complete all of the ten Bounty Hunter Missions.
Complete 60% of the game.
Complete 80% of the game.
Complete everything in the game!
Complete this level without dying. No Extras should be turned on.