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