Chaos: Yes, I think the espionage achievements are good.

Notably the 'First Line Defence' and ' Rear of Secrets' are excellent, both encouraging a different line up and increased risk. Yes going for them, but won't tell you which games ;)

It will take time to get 100 mines, and like you, never target them (unless desperate ). Even now, I still have to get the 'Successful Sapper.'

Have a count of 7 out of 100 on capturing undetected pieces, so nearly a tenth of the way there!