This Achievement requires you to release 6 characters from the Resolute Brig, the first 4 are unlocked to be released from the brig by completing story mode:
1. Poggle The Lesser
2. Dr. Nuvo Vindi
3. Wat Tambor
4. Lok Durd
The last 2 are unlocked to be relesead from the brig by completing the Republic Ground Assault Missions on Naboo and Christophsis
5. Nute Gunray
6. Whorn Loathsom
To unlock the cells you must use a Sith character, the TX-20 droid and Roborino (as he functions as a Bounty hunter and Charge charater) to activate various panels in the brig.
To open all the cells just follow the instructions listed as getting the Red Brick on this site:
http://www.videogamesblogger.com/2011/03/23/lego-star-wars-3...