Here is the full list of all 20 Death Point achievements.
Takedown 1 guard
Takedown 50 guards
Takedown 100 guards
Takedown 500 guards
Takedown 1000 guards
Shoot 10 guards
Shoot 50 guards
Shoot 100 guards
Shoot 500 guards
Shoot 1000 guards
Complete all objectives on mission 1
Complete all objectives on mission 2
Complete all objectives on mission 3
Complete all objectives on mission 4
Complete all objectives on mission 5
Complete all objectives on mission 6
Complete all objectives on mission 7
Complete all objectives on mission 8