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