Two Right Makes a Wrong
This mission you should get before fighting Krom Just to get it out of the way early.
You need to do the mission Missing Persons to get this mission.
Reaver Killed 0/1
What you want to do for this is do what I said earlier and get it out of the way.
you will eventually get to Reaver and he is not that hard but can be a problem.
Take out his enemies then face him the enemies here half the time are some sort of badass the WILL kick you ass.
After killing his minions start shooting him with a SMG,shotgun or combat rifle.
When killed you can grab his weapon called Reaver's Edge description is "The cutting edge"
Then go turn the mission in.