Fergie took charge of United in 1986 and compiled a list of achievements that could be listed in its own article.
The 70-year-old Scot looks like he will not be done managing anytime soon and will have plenty of future achievements that he would love to conquer as well.
For the time being, here are the seven standout moments of Sir Alex's legendary career at Old Trafford.
In his fourth season in charge of Manchester United, Sir Alex Ferguson finally delivered with a title.
United won the 1990 version of the FA Cup over Crystal Palace in two matches.
In the first match, Mark Hughes' 113th-minute goal tied the match at three and earned a replay for United.
In the replay, only one goal was scored and it was by defender Lee Martin.
This would be the first of five FA Cup titles that Ferguson would win in his career.
Three years after winning his first trophy at United, the 1990 FA Cup, Ferguson finally won his first Premier League title with the club.
In the first year of the new Premier League, Sir Alex and Co. finally took home the title thanks to a very important signing.
Eric Cantona was that important signing.
After moving from Leeds United, Cantona helped inspire a United team that had no real attacking threat during the season.
The Frenchman scored nine goals for United during the season and helped boost the club from fighting for the title to dominating the league and winning the title by 10 points.
One of the most difficult achievements in world football past or present is a treble.
The 1998-99 season was a magical one for Sir Alex and his club.
Manchester United were champions of the Premier League, FA Cup and UEFA Champions League.
Winning the treble was not an easy task in any of those three competitions.
In the EPL, United took back first place with three games left to go and only beat out Arsenal by one point.
In the FA Cup, the Red Devils were forced into replays of their quarterfinal against Chelsea and semifinal against Arsenal, which is remembered due to Ryan Giggs' goal in the 109th minute that may be the most important goal that the midfielder has ever scored.
The Champions League was no walk in the park, either.
United finished second in their group to Bayern Munich and after beating Inter and Juventus in the knockout stage, they faced a rematch with Bayern.
In extra time down a goal, Teddy Sheringham and Ole Gunnar Solksjaer cemented their place in United history with a goal each to win the European title in dramatic fashion.
After winning four Premier League titles in six seasons, Ferguson led United to one of the great achievements of his career, a three-peat.
Beginning with the treble winning season of 1998-99, Manchester United won three straight league titles.
After only winning the league by a point during the 1998-99 campaign, United blew out their title rivals in the next two seasons.
In the 1999-2000 season, United won the league by 18 points over Arsenal and by 10 the next season over the Gunners.
United were finally overtaken by Arsenal in the 2001-02 season.
This would be the first of two three-peats that Ferguson achieved with United, with one coming from 2006-2009 as well.
During the beginning of the 2000s, Arsenal were the dominant club in the Premier League.
The Gunners went undefeated through their 2003-04 title campaign and carried a 49-game unbeaten streak into Old Trafford on Oct. 24, 2004.
In that famous controversial match, United ended Arsenal's unbeaten run and in the long run deflated their morale as they lost out to Chelsea for the EPL title that season.
Not only did United end the unbeaten streak of the Gunners but they also ended their home winning streak in the return fixture on Feb. 1, 2005 with a 4-2 win at Highbury.
On May 21, 2008, Manchester United traveled to Moscow to face Chelsea in the first UEFA Champions League Final to feature two English clubs.
Not only was it a dramatic final, United won the Champions League title, as well the EPL title, on the anniversary of many significant events in club history.
2008 marked the 40th anniversary of the first European trophy won by United, the 50th anniversary of the Munich plane crash that claimed the lives of eight United players and it was the 100th anniversary of United's first-ever league title.
United were forced to go to penalties with their English rivals after the match ended 1-1 in regulation.
Edwin van der Sar's save of Nicolas Anelka on the sixth penalty kick was the play that won the title for the Red Devils.
Manchester United's last Premier League title came in the 2010-11 season.
With the title, United overtook Liverpool as the most successful club in English history.
United won their 19th top flight title, one more than the amount won by Liverpool.
Ferguson was the manager for 12 of those 19 titles.
Without Sir Alex at the helm, there is no possible way that United would have come anywhere near the record held by their rivals.