Score Tilt is a game mode available right off the bat. It's basically the same as Campaign, besides some minor differences:
-You don't select your speed, you tilt the phone forward and backward to increase/ decrease your flight speed which increases/decreases your score multiplier.
-There are no split paths
-The game doesn't end upon loss of all your lives, you restart at the beginning of the current level.
-The game simply loops after completing all the levels and will continue to do so until you stop playing. Each loop completion will result in higher difficulty the next go round.
For this achievement all you need to do is complete Level 1 in this mode.
There is also an achievement for completing a "loop" (All Levels) in this mode: