I’d recommend combining “2nd Rounder” and “Comeback City” together, as they go hand in hand. USe 2 controllers for the below method. If you only have 1, just play against Rookie and download my "49ERSLEGACY" for an OP roster!
I recommend you turn clock acceleration OFF for this achievement to give you more time, but honestly, if you are playing against a 2nd controller 1 min quarters non accelerated should be plenty of time. Aginst the CPU, you'll want to allocate more time.
• 1st Half (Q1 & 2): As Player 1, concede a safety. Punt the ball to Player 2, then Score a touchdown with Player 2, scoring the PAT. This will put Player 1 9-0 down. When Player 1 receives the ball again, concede another safety. Punt the ball to Player 2, then score another touchdown with Player 2. This time, do NOT score a PAT. This will put Player 1 17-0 down. You should still have time to miss 2 field goals (just try them from wherever you are on the field and purposely miss) as Player 1. If not, ensure you do so in the 2nd Half.
• 2nd Half (Q3 & 4): Reverse the above method with Player 1 doing all the scoring. You should be at 17-17. Then made sure you get within field goal range (as close to the end zone as possible) as Player 1 and take a time out with under 10 seconds left in Q4 (I did around 8-9 INCASE my FG got blocked). Score a field goal, and “2nd Rounder” should unlock immediately. Run down the clock and you should also earn “Comeback City”.