Here is the full list of all 10 Shooting Hurts achievements.
Complete the final assessment
Push the head into the opened door
Spare one pink enemy
Spare 3 pink enemies
We couldn't have done it without you!
Pop every cube in the level select screen
Complete an advanced, expert or cumulative test without ever leaving the ground
Complete an advanced, expert or cumulative test without ever touching the ground (starts once the door closes)
Complete all three expert tests
At least he seems to be pretty good at jumping