There's only one level to do this one, level 18. Do it in Rookie mode, as you have 5 lives. You have a bomber, and the level is very long with a huge number of trees. Getting 200 can take a few tries as you can miss some places with many trees (when your bombs are reloading). Some places also require 2 strafing bomb runs to be cleaned up, so dont hesitate to crash just after to destroy the remaining trees.
Also, in the last part of the level, don't destroy right away the enemy fighters, as the level would end earlier. Just keep focusing on destroying the trees and the trophy will be yours. Another useful tip, don't hold
all over the level as you'll miss some places with many trees. Use it when it's really needed, and don't forget, each tree counts, so try to destroy some isolated trees to increase your count.
(c) Linkinito @ PSTO