Great guide guys but I found two differencies. They doesn't matter if someone follows guide point to point but if you are trying to find crystals you are missing they might.
In Chap. 2 thers is 14 crystals sum but in text I counted 16, in Chap. 3 sum is also stated as 14 but in text I counted 13. Total for all crystals in text is still 72 but if you stack only total from beginings of chapters there will be 71.
And to anyone who aims for achievement good idea will be to write on paper/whatever total of any collectible you found yourself per chapter. Now I'm replaying basically hwole game because I don't know where I missed 1 last crystal.
: 150 Completed Aracde