Overwatch – What Do the Dots Next to the FPS Counter Mean?

From your comments that you may have switched heroes during your games, it appears to be a percentage of each game played * 1 per each win. So if you won four games where you played D.Va for 75% of each of the games and Mei for 25%, you would have the D.Va bar show 4*0.75 = 3 wins and Mei would show 4*0.25 = 1 win.

These bars obviously wouldn't show up as whole numbers most of the time if you switch heroes often during games as it is unlikely that you would end up with exact amounts of whole games played. It seems to round numbers to the nearest whole, so each of those games that you won that you played the character for less than 50% of the time slightly fills up the bar but is labelled as "0 wins."

The number signifies the amount of "Achievement Points" the achievement is worth. The amount of points directly corresponds with the Achievement's difficulty.

As of right now I cannot find a way to see all achievement points accrued. I don't like the current achievement menu; it shows you your 6 most recently earned achievements but you have no way of reading a description for them unless you find them on the drop down list. I would say achievement points are mainly for personal satisfaction; think of them as a reward for doing certain things. Some people may not feel like they have 'completed' a game until all achievements are unlocked. They give players something to use as a goal.