Tips getting the multi-million point Survival Mode Achievements?

[Aussiedroid]

I've tried and tried ... can't do it so was wondering if anyone has any tips or tactics to achieve these mega scores?

[76561198002352494]

I wouldn`t worry about it. Pretty sure there`s massive cheating going on in both high score tables at the moment.

[Corsario]

Leaderboards have nothing to do with Achievements.

[Chris]

theses achieves i think r unrealistic very very difficult i wonder if the devs got them