Time permitting, perhaps this weekend (11/20 or 11/21). But the computer aggressiveness shouldn't be too big a factor for either achievement, it's just a matter of aim so you can bounce the shot off your human opponent's car before it goes in the goal. But if player 2 moves at all, it changes how his computer team mate reacts. So don't let them move until you're achievement pops. It may take several games depending on your aim.
2 players can crank this one out for each other in about 60 min or less, depends on how straight your aim is. Just use the dash option to make sure you get there. This works even if player 2 scores the first goal in his own goal for you as the puck lines up on his side, so technically you have 3 players. 2 on your side, one on the opponents side.