I wouldn't mind if they surprise me, but I don't give them a lot of chances. PSG is beatable though for sure.
In the champions league, as a club that has the first experience to become in the highest league in Europe, they have shown a very convincing performance. Against PSG it could be an interesting match and as proof for Atalanta that they deserve to be in the Champions League and not as a team that is just because of coincidence or luck.