Here is the full list of all 48 LEGO Star Wars III: The Clone Wars achievements worth 1,000 gamerscore.
Complete the game to 100% (Single Player Only)
Collect all Gold bricks. (Single Player Only)
Collect all the minikits. (Single Player Only)
Using the Radio ability, command troops 50 times.
Convert every system to CIS. (Single Player Only)
Convert every system to the Republic. (Single Player Only)
Complete all Bounty missions. (Single Player Only)
True Jedi in every level. (Single Player Only)
Complete Hostage Crisis.
Have all your party members disguised as Senate Commandos in Hostage Crisis. (Story mode only)
Overheat and destroy 50 gold LEGO bricks.
Hijack 20 enemy units in Ground Battles.
Free all villains from the Resolute brig. (Single Player Only)
On a flying level, land a space ship whilst controlling Lando Calrissian.
Complete Castle of Doom.
Unlock/purchase all 'Clone' characters. (Single Player Only)
Unlock/purchase all 'Droid' characters. (Single Player Only)
Complete Zillo Beast.
Complete Grievous Intrigue.
Complete Rookies.
Complete Lair of Grievous.
Complete Destroy Malevolence.
Win 3 consecutive Arcade Mode Battles.
Defeat Anakin with Count Dooku
Destroy 100 Droids with the Clone Chain-gun.
Complete Shadow of Malevolence.
Complete: 5 Loop the loops, 5 Back flips, 5 corkscrews.
Complete Duel of the Droids.
Use Yoda to defeat 5 enemies with one lightsaber throw.
Complete Legacy of Terror.
Complete Weapons Factory.
Complete Jedi Crash.
Complete Defenders of Peace.
Deploy 500 Clones.
Using the Force, take control of a Super Battle Droid and destroy 50 other Droids.
Collect all Red Power Bricks. (Single Player Only)
Complete Gungan General.
Complete a story level without dying (and no invincibility cheat).
Complete Battle of Geonosis.
Land on the Invisible Hand.
Complete Liberty on Ryloth.
Destroy an enemy building with a proton torpedo
Complete Innocents of Ryloth.
Complete Storm Over Ryloth.
Complete Blue Shadow Virus.
Complete Ambush.
Complete The Hidden Enemy.
Complete Geonosian Arena.