So I used a LnP of Sega Superstars Tennis, and I gotten all the achievements about a month and a half ago. 2 problems: 1: It may have unlocked out of order (it's probably possible that the way the achievements unlocked for me, it could be in that order that way too, but it's most likely very hard and uncommon) 2: There are 7 online achievements, but I unlocked them offline, and now they're not timestamped I've been careful since then, using dummy accounts to test saves, but this one worries me nonstop. How screwed am I? Have any of you used LnP achievements that popped online too? Have you been resetted?
You are pretty screwed, yes you will get resetted. As people will report you who see this. I would just create a new GT.
I think he means if people look at your achievements and see that it was modded than they would report your gamertag.