Stanley took just two points from their first 10 League Two games this season, but now sit 16th in the table, seven points clear of the drop zone with a game to spare.
"It goes up there as a very special moment," he told BBC Sport.
"This time last year, I was a player in that dressing room. I said it was a great journey for me and probably one of the highlights of my career, even though it was a relegation battle.
"This time, we were in the same sort of thing, but I'm the manager. In my fledgling managerial career, it's got to be a highlight to maintain Football League status with the battles we fight on a daily basis at the club."
Beattie appeared for five separate Premier League clubs during a successful playing career, while the former striker also won five England caps.