Achievements:
Easy "Optical fiber" achievement:
Play level 3-20, and go down from the starting point to find two circuits on
your right. These two circuits are in a real "circuit" loop. Hold [Right] for
some time until the achievement is earned.
Easy "Suicidal" achievement:
Play a level with a bomb or a laser beam very near the starting point, such as
levels 3-20 or 4-6. Hold down the appropriate movement key for some time until
the achievement is earned.