This one might probably unlock during normal play, but to make sure it does: as soon as these blocks are available, which should be around level 20, slide or jump on such a block, take your fingers off your keyboard and wait until the achievement pops up.
To avoid getting kinda seasick due to the camera moving up and down, leave your PC, have some food, watch your favorite TV show, whatever. Come back in like 10 minutes and continue playing.