Here is the full list of all 60 TOXIKK achievements.
20000
10000 Kills
Rank 16/16
5000 Kills
Rank 15/16
Rank 14/16
Rank 13/16
Rank 12/16
Rank 11/16
1000 Kills
Rank 10/16
Rank 09/16
500 Kills
Rank 08/16
All contracts completed
Mission 12
Mission 11
Mission 10
Mission 09
Rank 07/16
Mission 08
Mission 07
Mission 06
-
Mission 05
Rank 06/16
Mission 04
Rank 05/16
Mission 03
100 Kills
Rank 04/16
50 Kills
Complete without using a vehicle
Rank 03/16
FIRST IMPACT
Mission 02
Rank 02/16
Mission 01
Rank 01/16