Who is the leading run scorer in cricket?
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Who is the leading run scorer in Test cricket and ODI cricket?
Sachin Tendulkar
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Who is the leading run scorer in List A cricket?
Graham Alan Gooch, OBE, DL Graham Gooch Graham Alan Gooch
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Who is the leading run scorer in First-class cricket?
Jack Hobbs
List of Cricket World Cup records
https://en.wikipedia.org/wiki/List%20of%20Cricket%20World%20Cup%20records
First-class cricket
https://en.wikipedia.org/wiki/First-class%20cricket
List of List A cricket records
https://en.wikipedia.org/wiki/List%20of%20List%20A%20cricket%20records
List of players who have scored 10,000 or more runs in One Day ...
https://en.wikipedia.org/wiki/List_of_players_who_have_scored_10,000_or_more_runs_in_One_Day_International_cricket
List of players who have scored 10,000 or more runs in Test cricket ...
https://en.wikipedia.org/wiki/List%20of%20players%20who%20have%20scored%2010%2C000%20or%20more%20runs%20in%20Test%20cricket
List of first-class cricket records
https://en.wikipedia.org/wiki/List%20of%20first-class%20cricket%20records
A One Day International (ODI) is a form of limited overs cricket, played between two teams with international status, in which each team faces a fixed number of overs, currently 50, with the game lasting up to 9 hours.
One Day International
First-class cricket is the highest-standard international or domestic matches in the sport of cricket. 
First-class cricket
List A cricket is a classification of the limited-overs (one-day) form of the sport of cricket, with games lasting up to eight hours. List A cricket includes One Day International (ODI) matches and various domestic competitions in which the number of overs in an innings per team ranges from forty to sixty, as well as some international matches involving nations who have not achieved official ODI status. Together with first-class and Twenty20 cricket, List A is one of the three major forms of cricket recognised by the International Cricket Council (ICC).
List A cricket
The leading run-scorer in cricket is dependent on the tournament and the time limits. ODI (One Day International) is a form of limited-overs cricket that can last up to 9 hours, and the leading run-scorer is Sachin Tendulkar, who is also the leading run-scorer in Test cricket. List A cricket games is also a form of limited-overs with games lasting up to eight hours, and the leading run-scorer is Graham Alan Gooch. First-class cricket is the highest-standard international or domestic matches in cricket, and Jack Hobbs is the leading run-scorer.