Can I find out how many Dragons I have killed?
On the PC, you can use the console command help DragonsKilled to find out how many dragons you have slain.
Go to general stats, this can be done by pressing the start button on the right side of you're controller, then you press the RT button on the right side, after you want to go to magic exactly 4 down. And then in the stats of you're magic you want to look at the "Dragon Souls Collected", which is 4 down. And how many souls that are there is the amount of dragons you have killed.