Psychonauts

Story Related, cannot be missed.

After completing Coach Oleander’s basic training, Sasha will invite you to train in his underground laboratory, which is located on the outskirts of "GPC and Wilderness". Use the button that he gave you to access his lab from one of the Geodesic chambers. It is here where you will learn the "Marksmanship" power and eventually earn the badge for it. Complete the level in Sasha’s mind and beat the boss there to earn this trophy.

Boss Tips:

The Mega Censor is a pretty easy boss. When the fight starts, start walking to the all the sides of the cube you are standing on and destroy the censor generators found on each side. The censors give energy to the Mega Censor so in order to damage him you must destroy all of the generators. Once the generators are destroyed, use your new Marksmanship badge to beat the Mega Censor from a distance. If you need health, defeat the smaller censors around the boss.