Flashback 2

This is when you are at the final level in the morph vessel. The game will switch to a 3rd kind of view with Conrad, and there will be four stages. In this stages, a fewer enemies will be thrown at you per arena, as the other Conrad from the first game makes his way killing each of the mastermind four parts. A countdown will enter as soon as you get in every one of the arenas, as well as a progression bar. When the other Conrad kills a section of the brain, the countdown will get to zero, the loading bar will be on the wider section for a few seconds and the image with the other conrad will have a green checkmark. In this moment, you will have to shoot at the mastermind weakpoint. Doing so will result in the enemies of the arena going away, and you going to the next arena.

It's in the last arena when you can get either trophy, whether is this one or the Gone full circle. To earn this one, DO NOT KILL the last weakpoint and instead, dodge enemies until the time runs out. Reload last checkpoint to get the other achievement.