All of these achievements will require you to join a room and win as a red hacker. If you want this achievement easily, then the way I recommend is to have a friend hosts a scene in the scene selection on scene 1-0 and the host invites you to join and he starts the level and pretty much stands there and takes the bullets and dies. This will give you 1 kill as a red hacker. Watch out because Rebecca may revive Jim and if you kill Rebecca wait for the timer to end and blue loses. You then get 1 red hacker win.