Just a warning before the guide, if you are going for theses following achievements :
The Rock hard! achievement in Final Exam worth 233 pointsComplete all the missions in the game in "Rock hard" mode.
When you start the game, choose wisely a character and STICK WITH HIM / HER.
Because if you want to change your character and don't want to pick up the collectibles all over again, you just can't.
Also don't be an idiot like me and DO NOT DELETE YOUR CHARACTER
, it might be obvious but you just lose everything if you do that, i thought i'll get my upgrades back to use them again on a better character for the hardcore mode, i've never been so wrong.
Now the videos for each levels with all collectibles, guns and sodas.
If you're going for the guns only, even if i would not recommend you to do that, i added in the description on each videos the right moment for each gun.
Note : as i was not following any guide, the collectibles are not in a straight order, but you shouldn't miss any, i edited some parts of the video to avoid missing collectibles, so if you see 7/7 following by a 4/7, it's ok, just don't be surprise if you go back at a place you were before.
For the level 8, avoid the roof where you have to go for an objective on the far left at the beginning, try to pick up all stuffs you see before in the video. Level 1 :Level 2 : Level 3 : Level 4 : Level 5 :Level 6 :Level 7 :Level 8 :