This is quite easy once you've fully upgraded all of your objects (health, weapons), and shouldn't really need any first aid sprays; since your health is restored upon loading a checkpoint.
Once you've completed the 'campaign', simply use the system options and change the game difficulty to 'Hard'. You can then select to play any missions you choose, and in any order. The achievement will pop upon once you've completed all 9 missions.
Note: Make sure an keep track of which levels you've completed on hard, as the game will not do this for you.
QTE can be set to any difficulty you choose, and will not affect the outcome for the achievement.
--cheers.