This pops for you once you complete the main game but only if you've done all of the secondary quests throughout the game (as indicated by having the initials of the person giving you the quest be in black instead of gold), as well as the one optional race right before the end of the game.
Do all of that, finish off (spoiler!) at the (spoiler!) and POP, 110 points once the credits finish rolling.
The secondary objectives can also be completed after the main storyline has been finished (credit to the Mr BUDDHA KING).