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