To get this achievement you have to select:
Single Player > Open World > Crazy GranddadThe point of the "Crazy Granddad" Game is to follow an HUD arrow that leads you to a "Crazy" item (this is the item needed for the cheevo NOT the Boost)
The "Crazy" item also adds time to the clock,collect as many of these "Crazy" items as possible before the time runs out.
The achievement pops when the game ends.
Have fun