To unlock the Hyper-space fighter Vic Viper is back! trophy in Arcade Classics Anniversary Collection, you will need to score 150,000+ points in Nemesis.
The easiest way to unlock the trophy is to set the difficulty to easy and the number of lives to the max (7). Play through as normal, and after each section save the game. If you use lose your remaining lives on a section before you unlock the trophy, reload and try again.