Exact positions of all 101 Doomers on Level 1, 2, 3. 

All 101 Doomers in level 1! 

All 101 Doomers Locations on Level 3 

Here you have my playthrough video of the game. I hope it helps someone in case you got stuck in some part of the game ^^. This time I've managed to get 100% of the achivements. If you need specific directions let me know in the comments.