Here is the full list of all 38 PURGE - there are Three vs Blood achievements.
Reach Copper I
Reach Copper II
Reach Copper III
Reach Bronze I
Reach Bronze II
Reach Bronze III
Reach Silver I
Reach Silver II
Reach Silver III
Reach Gold I
Reach Gold II
Reach Gold III
Reach Platin I
Reach Platin II
Reach Platin III
Reach Diamond I
Reach Diamond II
Reach Diamond III
Reach Champion
Blow up 50 container gates!
Blow up 30 zones doors!
Collect PowerUp's, double points!
Activate an electric ground trap!
Activate an electric ground razor trap!
Activate an electric standing light!
Activate an fire ground trap!
Get supplies from the ammunition box!
Collect the health!
Get supplies from the health box!
Collect PowerUp's, Maximum Ammo!
Collect PowerUp's, quad points!
Get a new weapon from the random weapon box!
Get a new weapon from the random weapon heavy box!
Reach a level of 10!
Reach a level of 50!
Reach a level of 100!
Reach a level of 250!
Reach 1000 Zombie Kills!