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