Here is the full list of all 14 Roundabout 3 achievements.
Fully complete the tutorial level.
Fully complete the triangle level.
Fully complete the square level.
Fully complete the pentagon level.
Fully complete the rectangle level.
Fully complete the micro level.
Fully complete every base level.
Get a negative score.
Fully complete the rhombus level.
Fully complete the spiral level.
Fully complete the circle level.
Fully complete the right triangle level.
Fully complete the dot level.
Fully Complete the line level.