Sharp Shooter Trophy in Premier Manager
Achieved when one of your players scores 30 goals in a Season.
How to unlock Sharp Shooter
This should unlock naturally on your way to "Loyalty" and very possibly in Season 1. A few tips to increase your chances:
Assign your highest scoring striker after 5 games to be your penalty taker
Play a lone striker formation, again assigning penalties to him
Play attacking formations
A mixture of the above should be more than enough to get 30 goals out of your star striker over a full season.