From the main menu, select the option titled 'Training'.
Select any of the options from the list.
As there is another achievement for completing all tutorials it makes sense to start with the very first batting tutorial.
Select 'Batting Tutorials', then 'Basics' and then 'Batting Basics'.
Once the tutorial starts, follow the instructions. You will normally face 3 balls for each batting technique. Once you have faced a total of 50 balls, the achievement will unlock.