Just to add to this excellent guide, I found a VERY fast villain mission in the 1-14 range,
Operative Kuzmin - Underdogs Never Win
Part 1 - kill 5 longbow on the street, all grey so done in a second, all very close to the contact
Part 2 - Interrogate Longbow Prisoner - again, close to the contact, simple talk to mission, done in seconds, especially if you chose the last option for the conversation
Part 3 - Find 3 codes from Longbow Technicians, once again, close to contact, kill 3 pairs of longbow for the code keys
Part 4 - Arm 3 more bombs - Once again, close to contact, 3 glowies to click, all the nearby longbow are grey so don't affect you, all glowies close to each other so done in seconds.
Part 5 - Destroy Longbow's Base in Mercy - Only actual door mission in the arc, very close by, always same door, kill a couple longbow to get the costume, run past everyone to the final room, listen to longbow conversation, click glowie, kill two lieutenants and then defeat ambush.
The last battle against the 2 lieutenants is the only slightly tricky parts, especially when debuffed or no enhancement, but the whole arc takes just a few minutes, maybe 5 minutes with no travel powers, is very fast and also works great for the time and no deaths mission as well. Got all of the badges in about 15 minutes earlier :)