Yeah, i think o0Ara0o problem and these problem, the 2 achievement is relationated by some way, i've read tons of people who pop up TT and doesn't pop up Skills achievement and people who have Skills and doesn't pop up TT and all of them confirm that they follow the guide... (most of all the youtube guide of splitplaythru)
Yes, i's easy to fail a item but, the skills??
I can't confirm at 100% but day a day, and forum a forum i realize it may be true.
...And my GF