Damnation

Just to clarify. If someone gets disconnected while you are going for this achievement, disconnecting wont break your streak. just dont join another match of a different type and complete it, if you do this you will reset the streak.

Just have the host end the game and have him/her make the match again. Even if the host gets disconnected it wont rest their streak either.

win 10 straight ranked multiplayer matches, the fastest way to do this is problably team deathmatch on boiler room. let the losing team go to the middle of the map where the winning team is waiting for them. with 4 people it takes about 90 secs for a game + loading times. Hope this helps :)