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