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