Half-Life: A Place in the West

For me 4 of the 5 chapter 2 achievements did not unlock after reading through chapter 2 with default zoom.
2 of the remaining 4 unlocked by reading through it with 5% zoom.
And the remaining 2 unlocked by reading though with -100% zoom.

I do not remember which ones unlocked with which zoom level since the achievements for chapter 2 seem quite buggy in general.
But this is how I got 100%....