Anywhere to destroy sentry turrets offline?

[A-L-I-E-N]

I am after the challenge Sentry Duty - destroy 5 sentry turrets. Is the only way to do this online playing survivor? Not easy when no one ever plays survivor online anymore.

[Inverse Effect]

Yep. Bug-hunt is the only way i know of to Deploy Sentry guns. Nobody plays this game anymore so trying to get the achievement is impossible.

[Corporal Hicks]

Your best bet is just trying to put together a small play group and doing some achievement farming.