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