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