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