Crash-Kill Lvl 1G 10

Must be obtained in a single playthrough. Returning to the title screen, through quitting or death, resets the progress to zero.

Setup:
Pick the first guy as your ship. Hold to fire your primary weapon, release it to move faster, and tap to perform a diagonally forward dodge in the direction you're strafing. This allows you to pass through objects unharmed, with good timing. Occasionally you'll find a power up which you must dodge into to collect. Sometimes dodging will leave a green arrow on the screen - press again to perform a chain dodge, often destroying things in the process. If you ever become a frog (!), your dodge becomes much shorter - prepare for this.

Method:
This one requires a bit of progression, as you will need to keep topping up your shields as you go to avoid dying. Either fly straight into an enemy and kill it, using a shield in the process, or use to dodge into (preferably a group) of enemies to make this a little safer and a little quicker.

Crash-Kill 5 enemies: Achievement unlocked!