In actuality I haven't unlocked that particular code... However, I was able to find a webpage that contains a list of all of the "achievements." (hence where I found the 10x stud multiplier code) I found that when visiting the game's site, this page was being used as a resource for the online game. I have included the link to the page in question. Please note that this page is coming off of Lucasarts official domain, and as such is an legitimate document created by their personnel.
Vader - MOSTIMPRESSIVE
Han Solo - NERFHERDER
Leia - YOURWORSHIPFULNESS
Boba Fett - SARLACCFOOD
Boba's Jetpack - JETPACK
Chewbacca - LETTHEWOOKIEEWIN (don't forget the 2 E's at the end of wookiee)
Emperor - DARKSIDE
Ben Kenobie - MYONLYHOPE
Luke - KISSEDMYSISTER
Lando - CLOUDCITYGAMBLER
Savage Oppress - OPPRESSIVEMAUL
Codes for real game:
Aayla Secura: 2VG95B
Mace Windu: 8NVRWJ
Darth Maul: QH68AK - to unlock, upload 5 pieces of media from the site on your facebook page
Bossk: 2KLW5R (unlock 'my kind of scum' to get this code)
Character Studs: 25DGNM (unlock 'banes escape' to get this code)
10x Studs: ????????
STUD MUFFIN - 1,000,000 studs
SITH MASTER - unlock at least 5 sith
STUD MUFFIN - 500,000 studs
CLONE COMMANDER - unlock rex, fox, & cody
BOUNTY HUNTER - unlock a bounty hunter
JEDI MASTER - unlock at least 7 jedi
BATTLE OF GEONOSIS - unlock yoda
INTERGALACTIC - visit 9 planets or ships
SITH APPRENTICE - unlock at least 1 sith
LAIR OF GRIEVOUS - unlock grievous
EXPLORER - visit 6 planets or ships
JEDI KNIGHT - unlock at least 3 jedi
CLONE CAPTAIN - unlock 3 clones
CLONE SERGEANT - unlock 2 clones
STUD MUFFIN - 100,000 studs
WANDERER - visit 3 planets or ships
HUMAN CYBORG RELATIONS - unlock a droid
PADAWAN - unlock at least 1 jedi
SHINY BADGE - unlock 1 clone (shiny and new just like you)
MY KIND OF SCUM - Leia's head on boba's body
BLUE SHADOW VIRUS: Jar Jar head over Padme's Body( legs included)
ORDER 66: Palpatine's head over clone troopers body
BANES ESCAPE: Bane's head on clone trooper's body
?????? - ??????
?????? - ??????
(2 remaining to be unlocked)
I read on the Facebook discussion page that it is 13 letters long - that should give us something to go by.
Come to the dark side - we have cookies! Jedi interrupts DON'T LISTEN! THEY'RE ACTUALLY CHOCOLATE CHIP COOTIES! Sith uses Force Lightning on Jedi
Bunch of idiots. I have said, very clearly that if i had the code, i would say it.
I did not say that i HAD the code. You people can't even read xD
Yeah later on i said i had it, i was bluffing, seeing how long you guys were fooled.
In facebook mert karaca knows luke's code but it does not want to say it it is necessary to force it.
Put in the seeker the official lucasarts lego star wars fanpage
Put forums and search CODES FOR LUKE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Then do click and there sides
DUDE! Seriously stop asking so much!! Not everyone is on 24/7 and can answer your question immediately. Just calm down man. To answer your question...nobody knows! We've all been trying everything but no one has figured it out. Just be patient man.