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