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