Here is the full list of all 42 LEGO Star Wars: The Complete Saga achievements worth 1,000 gamerscore.
Complete the game to 100%
Play through an entire level online
Collect all available Gold Bricks.
Finish Cloud City still wearing a Helmet.
Collect all mini-kits.
Collect all available red bricks.
Sell your landspeeder to the Jawas.
Get 100 points in Arcade Mode
Max out the stud counter.
Destroy 10 characters with one thermal detonator.
Revenge: Destroy Anakin with Dooku.
Start a Cantina Fight with 50 casualties.
Crossover: Destroy The Emperor with Darth Maul.
Revenge: Destroy The Emperor with Mace Windu.
Revenge: Destroy The Emperor with Kit Fisto.
Unlock all characters.
Finish Episode VI in story mode.
Finish Episode V in story mode.
Shoot First
Finish Episode III in story mode
Destroy 5 people with one attack (Jedi super slam).
Revenge: Destroy Darth Maul with Qui-Gon.
Crossover: Destroy Jango Fett with Boba Fett.
Perform 200 perfect lightsaber deflections.
Set off all three Discos.
Break Jar Jar 20 times.
Crossover: Destroy Anakin with Vader.
Finish Episode II in story mode.
Disable 5 Droidikas with R2D2.
Ride all mounts types & ride-ons.
Perform 20 unblockable combo attacks.
Make 100 Build-its throughout the game.
Wear Every Hat.
Revenge: Destroy Darth Vader with Obi-Wan.
Finish Episode IV in story mode.
Death Star Trench Run without Firing.
Destroy 50 TIE fighters.
Perform 200 blaster character dodges.
Destroy 300 stormtroopers.
Pull 25 arms off other characters.
Finish Episode I in story mode.
Destory 300 droids.