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