cerberus???, i cant rember that mission
It was an organization that killed Admiral Kahoku's men. You were to go to three of their bases and eliminate them.
Whatever the group did had something to do with the Rachni and Creepers.
In the end, the Admiral is found dead.
Afterwards, you are sent to Cerberus's main base of operations, then the Shadow Broker contacts you and asks for the information you've gathered, you can play it out either renegade-like or paragon-like by either giving it to him or not.
The thing is, your choice doesn't make a difference in the game, but it may carry over to Mass Effect 2