Here is the full list of all 48 LEGO Star Wars III: The Clone Wars achievements worth 1,000 gamerscore.
Complete Geonosian Arena.
Complete Jedi Crash.
Complete Defenders of Peace.
Complete Rookies.
Complete Grievous Intrigue.
Complete Battle of Geonosis.
Complete Zillo Beast.
Convert every system to the Republic. (Single Player Only)
Free all villains from the Resolute brig. (Single Player Only)
Use Yoda to defeat 5 enemies with one lightsaber throw.
Defeat Anakin with Count Dooku
Complete all Bounty missions. (Single Player Only)
Destroy 100 Droids with the Clone Chain-gun.
Have all your party members disguised as Senate Commandos in Hostage Crisis. (Story mode only)
Complete: 5 Loop the loops, 5 Back flips, 5 corkscrews.
On a flying level, land a space ship whilst controlling Lando Calrissian.
Unlock/purchase all 'Clone' characters. (Single Player Only)
Collect all Red Power Bricks. (Single Player Only)
Complete a story level without dying (and no invincibility cheat).
Using the Force, take control of a Super Battle Droid and destroy 50 other Droids.
Complete the game to 100% (Single Player Only)
Win 3 consecutive Arcade Mode Battles.
Using the Radio ability, command troops 50 times.
Collect all Gold bricks. (Single Player Only)
Unlock/purchase all 'Droid' characters. (Single Player Only)
Convert every system to CIS. (Single Player Only)
Collect all the minikits. (Single Player Only)
Overheat and destroy 50 gold LEGO bricks.
True Jedi in every level. (Single Player Only)
Complete Hostage Crisis.
Complete Castle of Doom.
Land on the Invisible Hand.
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.
Hijack 20 enemy units in Ground Battles.
Deploy 500 Clones.
Complete Gungan General.
Destroy an enemy building with a proton torpedo