This guide will let you know how to unlock the “Chopper’d Up” trophy in Grand Theft Auto Vice City.
Missable Trophy #2
You can unlock this trophy in the mission “Demolition Man” for Avery Carrington, available after completing Four Iron.
You have to kill all enemies before placing the last bomb, using the RC Chopper’s blades to unlock this trophy.
The trophy/achievement will pop up once the last enemy has been killed. After that, it’s safe to place the last bomb.