well just wanna ask how many mission are there cuz i would like to do all of them and dont miss any event 
EDIT: I am weird and i always want to complete the game 100% 

There are 122 Quests in the game, but you don't get all of them in a single playthrough as it depends on your choices and order of events in some cases. The walkthrough lists most of them.

Sorry Quest lost chance How to do

You are not weird for always wanting to complete 100% of your games, you simply are what we call a completionist, and you are far from being alone, we are many to share the same will to not miss anything and experience a story to its fullest. ;-)