the welcoming the federation mission wont complete. it was changed to 25 individual ships (even though they are still 14 levels below you) and destroying them does not make the mission complete and had to be dropped.
This mission used to be kill 6 groups of Feddies. It got changed to 25 Feddies instead. Except the old goal is still hanging around so once you get to the 25, it hits the 2ndary goal of 6 groups which is unable to be completed due to programming.