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