Marble Blast Ultra

Most Beginner levels are quite simple to get under par time on, and you'll get under par by just doing a clean run without any falling and just keeping your pace up (some you'll get it twice as fast as par that way).

The only level I had to try a few times for myself was level 19. What you do there is as follows:

Go left, turn the camera right and head onto the ramp. Jump at the top and gather the gem on the block.
Move on a little and make a u-turn to the left onto the next ramp. Don't jump this one or you'll go over the gem.
Another u-turn to the right takes you to the final ramp. Jump it to a bridge. Then get to a standstill on the corner, jump to get the gem, and head for the finish.

If you do all this fast enough, you'll get under par time.

Once you have a level highlighted, near the bottom right hand corner there will be the par time for that level. What you have to do is complete that level under the time given, once you complete all of the beginner levels under par time you will get this achievement.Also once you complete a level under par time, when your looking at that level again notice your time will be green, if you complete the level over par time it will be red.