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