Here is the full list of all 19 Red Risk achievements.
Survive ten tournaments.
Survive five tournaments.
Kill 2500 Infected.
Reach level 10.
Reach level 9.
Reach level 8.
Kill 1000 Infected.
Stay alive for 5000 seconds.
Reach level 7.
Survive your first tournament.
Stay alive for 2500 seconds.
Stay alive for 1000 seconds.
Reach level 6.
Kill 100 Infected.
Reach level 5.
Reach level 4.
Reach level 3.
Reach level 2.
Enter the arena.