One of the easier target time achievements. I haven’t played Goldeneye in 20 years (and was by no means good at it back then) and I still got this first try. All you need to do is get to the dam, shoot a few alarms in the huts, then jump off the dam itself.
Change the controls so you move & strafe with the D pad and press up & left/right so you’re moving diagonally and you move *much* faster. This gets you through the level in less time, and makes it harder for the enemies to shoot you.
Skilled players can do this sub-1:30. I did it in less than 2 minutes. The target time of 2:40 is very attainable even for novices.