Here is the full list of all 11 Helion achievements.
You have made your first Elimination
You have made 10 Elimination
You have made 20 Elimination
You have made 50 Elimination
You have made 100 Elimination
You have made 200 Elimination
You have made 500 Elimination
You have made 1000 Elimination
You have made 2000 Elimination
You have made 5000 Elimination
You have made 10000 Elimination