Make sure you have one kamikaze enemy (flying creature) blue or red, I believe the blue ones are a bit slower. This is easiest on plain ground such as the chess-board.
move your tentacle creature with small steps in a small circle and don't let the kamikaze touch you. after a few circles the kamikaze wil keep it's path aroud you while you dont move (you can totally stand still) and it comes closer, after a few laps the achievement will pop.
There is a youtube video I don't take credit for
https://www.youtube.com/watch?feature=player_embedded&v=...