very easy go to game settings > penalties and put offsides to 0 now pick whoever you want on the defense and have him stand next to the QB and when he hikes it just tackle him for a sack. do this 5 times and achievement will unlock after the game is over.
**note if the QB was going to hand off the ball to the running back it or if he started to scramble forward it will count as a Tackle for loss only