Can someone make a guide or let me know how to get to and beat level 40 so I can unlock the speedrun tool, thanks!

(I don't see why I'd need to beat the whole game for the speedrun tools to begin with, but ok)

Mission 40 unlocks after you've completed all of the logs (which unlock as you beat special levels). To unlock special levels you need to find secret collectibles throughout the game, levels with these collectibles are listed on mission 38.