To ease your quest for the Story Teller and Legend Teller achievements, I've embedded AchievementHunter's log walkthrough videos below.
The Legend Teller achievement requires 150 of a total of 168 available logs, so it is possible to miss out on a few and still get the achievement. Each log which automatically pops up on the HUD during the game it also counts towards the 150 required. This means that of a possible 168 you are only required to pick up or activate 50 logs manually.
Follow this video you should be able to obtain the Story Teller achievement (75 logs) at the end of Chapter 5, and the Legend Teller (150 logs) during Chapter 11.
SPOILER ALERT: The below videos do contain a few spoilers every now and then. So if you're a story addict or what not, just run through the game without these videos.