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