The Engineer achievement Patent Protection is eluding me.
The achievement's description is:
Destroy an enemy Engineer's sentry gun
with a sentry under control of your
Wrangler.
I've destroyed mini-sentries and regular sentries currently being built with a wrangled Mini-Sentry, but still haven't gotten this achievement.
Are there any restrictions as to what type of sentry you're using, what type of sentry they have, and the enemy sentry's build status?
Best Answer
You will not get the achievement if the enemy sentry is in the construction process and it must be a regular sentry. Your sentry on the other hand can be any kind.
http://wiki.teamfortress.com/wiki/Obtaining_Engineer_achievements