I found this game very hard, but maybe I gave up too soon. But the bit I got to was I was in a room, like a laboratory or something and then I was sealed in and had to fight and kill a certain number before the door opened. Well my problem was that I had so little ammo that I didn't have enough to really do anything.
Only option I had was to keep going and get annoyed not getting anywhere, start again or give up. It's only one of two games i've ever given up on.
There are 5468 achievements with a total of 118135 points.
I have 2814 achievements with a total of 55710 points.
Achievements percentage: 51%
Points percentage: 47%