Jetpack Joyride

This achievement requires that you knock over 1000 scientists. They can be knocked down by vehicles, the guns from the default Machine Gun jetpack, or any hazards or gadgets. This will come naturally as you work towards unlocking all of the other achievements (only if you stick with the default jetpack). As long as the scientist falls down in any way, it will count towards this achievement. Simply walking into them does NOT knock them over. NOTE: Never use the Nerd Repellant gadget unless going for a specific achievement or mission, as it will remove all the scientists.

This will most likely unlock as you are working on the other achievements. Simply knock over scientists on the ground by hitting them with your jetpack or with vehicles. However, just running along the ground will not count as knocking over the scientists.