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