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