I've notice that some achievements during the LW S2 doesn't work even though I successfully complete them. Take for instance Sneaky Sleuth, Super Sleuth and Shoddy Sleuth during the Party Politics. Even though I followed both suggestions on the Wiki and on Dulfy.net I still don't get the achievement. I read somewhere they some of those you need to replay the chapter in order to get, since some are opposite to each other (like in my next example), but no matter if I do it on a fresh character or replay it, I don't get credit for it.
The other example is during Caithe's Reconnaissance Squad and there is one, No Thanks to Canach, that should be impossible to fail. I don't plant any mines on any of the Mordred corpses and yet I don't get the achievement for it. There is another one, the opposite so to speak, where you plant mines on all corpses (10 of them) which I've done, I counted them all. Still, no achievement after I leave the instance.
So before I send a ticket a Anet, have anyone experienced this and/or have any suggestions on what could have gone wrong? Like I wrote, the No Thanks to Canach should be impossible to fail (don't plant any mines, which I don't!) and yet I don't get any achievement. I can't imagine that the achievement is calculated and given to the player first after the entire chapter is complete?