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