There is a video provided by Somewhat Awesome Games that highlights where all of the emblems can be located throughout the boy's journey across the four distinct chapters. There should always be enough emblems to finish one per stage, plus an additional one for the fifth emblem itself. Counting that all together, there are eighteen. I have highlighted the time-stamps at which you can find the specific emblems you need for each chapter.
* If voted negatively, please elaborate on how I can go about giving you better directions towards finding these.
Chapter One:Fox, top left (1/4): 0:06 - 1:00
Fox, top right (2/4): 1:02 - 1:53
Fox, lower left (3/4): 1:59 - 3:10
Fox, lower right (4/4): 3:17 - 4:00
Boy, top (1/4): 4:08 - 6:11
Chapter Two:Bird, top left (1/4): 6:22 - 6:51
Bird, top right(2/4): 6:56 - 7:25
Bird, lower left (3/4): 7:30 - 8:11
Bird, lower right (4/4): 8:13 - 9:07
Boy, right (2/4): 9:13 - 10:08
Chapter Three:Boy, bottom (3/4): 10:15 - 11:17
Sentinel, top left (1/4): 11:21 - 12:24
Sentinel, bottom right (2/4): 12:27 - 13:07
Sentinel, bottom left (3/4): 13:12 - 13:55
Sentinel, top right (4/4): 13:59 - 14:29
Chapter Four:Shade, top (1/2): 14:34 - 14:59
Boy, left (4/4): 15:04 - 16:00
Shade, bottom (2/2): 16:06 - 16:34