Here is the full list of all 17 Machine Gun Fury achievements.
100 tank kills
75 enemy kills
First enemy kill
Complete Level 1 without using grenades.
200 enemy kills
5 levels completed with 100% enemy kills
Complete Level 1
Complete Level 2
Complete Level 3
Complete Level 4
Complete Level 5
Complete Level 6
Complete Level 7
Complete Level 8
500 enemy kills
Died without a single kill
2 levels completed with 100% enemy kills