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