Impossible Trinity
Impossible Trinity is a Xbox 360 and PC achievement and a PlayStation 3 trophy awarded to the player after completion of mission Museum Piece in Grand Theft Auto IV.
The achievement is named as such because during this mission all three main characters (Niko Bellic of GTA IV, Johnny Klebitz of The Lost and Damned, and Luis Lopez of The Ballad of Gay Tony) are brought together at the same place and time in an amazing coincidence.