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