FYI, re collectible crests.

The game displays the number of a collectible found thus far (example, "10 of 42 crests") as you go along, & that number is always correct; however, the fifth crest you find isn't added into the "achievement" total (which you can also access & view from the game screen). Thus, even though you collect all the crests, the "achievement" total will only show your having found 41 of 42. It doesn't prevent you from earning the achievement, though.

Another heads up about the achievements: Even if you earned one, like finishing a HOG in under a minute, you won't necessarily get it right away. At the end, though, all the achievements you earned are there, even if the game seemed to be stingy about handing them out during the game play. At least, that was the case for me.