Mafia 2 hard to kill achievement?

[joa]

I try to do this achievement entering an armored truck with 4 star search and stayed 20 minutes and nothing happened there
anyone know how to do?

[Razorbak86]

http://www.trueachievements.com/a61566/hard-to-kill-achievement.htm

[joa]

Originally posted by Razorbak86:

http://www.trueachievements.com/a61566/hard-to-kill-achievement.htm

thanks