I think the "help" on that quest was something along the lines - you individually get a team wipe, or a teammate of yours has to get 3 team wipes. If you're struggling, cheese the hell out of it. Invade with full super, full heavy, etc. HMGs work wonders. The new Hammerhead drops with Killing Tally....that should work. I remember the 21% Delirium (Killing Tally) days, that gun was an absolute terror in Gambit.