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