Here is the full list of all 17 Westboro achievements.
Kill 1000 people.
Put glasses on.
Beat the game with Recon.
Achieve the famine ending.
Beat the game on any difficulty with any character.
Beat the game on medium difficulty.
Kill 500 people.
Squash 50 rats or roaches.
Kill 100 people.
Kill 25 people.
Beat the game with Valkyrie.
Beat the game with Spectre.
Achieve the war ending.
Achieve the plague ending.
Beat new game plus.
Beat the game on hard difficulty.
Beat new game on hard difficulty without dying. (not new game+)