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