Here is the full list of all 11 ProtectHeart achievements.
Shoot down your first blue blimp
Shoot down your first red blimp
Shoot down your first black blimp
Shoot down your first fighter jet
Shoot down 500 blue blimps in 1 game
Shoot down 100 red blimps in 1 game
Shoot down 100 black blimps in 1 game
Shoot down 100 fighter jets in 1 game
Lose 25 games in a single session
Get to level 500
Get to level 750