If you have beat Dead Space 3 in Classic Mode, you will obtain MK-II tips. This could be your first achievement. All you have to do is go to a bench and apply it to any weapon it's available on (upper or lower tip).
If you have not beat Dead Space 3, you will not be able to obtain this in Pure Survival Mode. You will have to play the game on normal mode. There are two doors you need a torque bar for, so make sure you have the resources to make at least one. The second room requiring the torque bar has a tip in it.