Invisible infiltration achiev fail
Just don’t do it. No, seriously – you’ll save yourself nerves, time (A LOT of time thanks to the stupid cutscenes). After failing this kitten thing 4 times (3 of that at the very last hit in the bossfight, 2 times thanks to it just bugging out), i just quit it and gave up on doing that particular achievement.
20 AP is just not worth that kind of frustration.