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