What's the difference between a bolt action and assault rifle?

Question

I'm playing Call of Duty 3, and there are two achievements that deal with rifles.

One tells me to only use bolt action rifles, and the other says to use assault rifles.

I have saved the game right now, and I have a scoped Lee-Enfield and some German rifle. I used the same sort of weaponary, and I didn't get the achievement.

So what is the difference between those two rifle types?

Answer 1

A bolt action requires the user to manually operate the bolt to eject and feed the cartridges in and out of the rifle chamber , an assault rifle has an automatic bolt which will fire , eject and reload the chamber only requiring the user to operate the trigger , usually works from gas pressure to work the bolt.