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