Unlock all other trophies.
Survive Wave 1.
Survive Wave 2.
Survive Wave 3.
Survive Wave 4.
Survive Wave 5.
Survive Wave 6.
Survive Wave 7.
Survive Wave 8.
Survive Wave 9.
Survive Wave 10.
Survive Wave 11.
Survive Wave 12.
Survive Wave 13.
Survive Wave 14.
Survive Wave 15.
Survive Wave 16.
Survive Wave 17.
Survive Wave 18.
Survive Wave 19.
Survive Wave 20.