If you are unsure of what a 'And 1' is. Its basically when a player with the ball is fouled on a shot attempt and he MAKES the shot. If the shot hits or misses the player who was fouled still gets to attempt a free throw, 1 free throw if the shot was made, 2 if the shot was missed. But if fouled on a 3 point shot that misses he gets 3 Free throws.
So to make the front end of an And 1 you basically need to be fouled on a shot attempt and make the shot! It's much easier to unlock this achieve when driving to the basket for a layup or dunk. But it can happen when attempting a normal jump shot but the chances are slimmer.
Good luck!