Achievement: Prison Architect

Hi there! I cannot get the Prison Architect Achievement (Finish Level 6 (Behind Enemy Lines) within 15 Minutes (Standard Campaign)). Also, when i destroy the enemy portal it happens, that the mission is not finished.

Does altering game speed has influence of achievements ???

I think maybe patching and fixing the Game to the current state has made the achievement impossible. Current version: 1.4.3f5.

Thanks for your help