A simple leveling achievement for the Pentagram. It is unlocked by surviving for 20 minutes as any character. Christine Davain starts with the weapon, but in order to unlock her you must level the Pentagram to level seven which negates the purpose for us. As per usual, the more XP boosting power ups you have the faster you will level and the quicker you can get drops which will give the chance of levelling the Pentagram.
The achievement will unlock after you finish the level with the Pentagram to level seven.