Here is the full list of all 8 Wraith trophies - there are 3 bronze, 3 silver and 2 gold.
Survive 50 Levels on any map.
Survive 40 Levels on any map.
Survive 30 Levels on any map.
Survive 20 Levels on any map.
Survive 10 Levels on any map.
Survive 5 Levels on any map.
Shoot an Enemy in the Head.
Buy something from the market!