Night-time Champion
Win 10 competitions at night

This is the easiest way to get the achievement. In the main menu go to online, and then host game. Under map settings change the time to Night (Hard), and make sure the time limit is set to 15 minutes. Create game and press ready. You can play by yourself. Just catch one fish, and when the time is up you win. Do this ten times and the achievement is yours. Hope nobody joins or else your in for a competition.