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