#5. Scoring at least 50 goals for 6 consecutive seasons while playing in a Top-5 European league
Lionel Messi has scored 91 goals in a calendar year and 73 goals in a season but even he has scored 50 or more goals in only three consecutive seasons.
Between the 2010/11 and 2015/16 season, Ronaldo scored 53, 60, 55, 51, 61 and 51 goals respectively. In total, he scored 331 goals during this period in only 313 games.
To give an idea of how difficult this feat is, Mohamed Salah scored only 44 goals at the end of his spectacular 2017/18 season. Therefore, it's quite an achievement to score 50 goals in one season but to do so in six consecutive seasons is mindblowing.