6. Borderlands 2 - Well That Was Easy
Borderlands 2 is a game that doesn't take itself seriously. The achievement list showcases that perfectly. Well That Was Easy is your reward for completing the quest "Shoot this Guy in the Face", found about halfway through the game. A bandit is begging you to shoot him in the face, so you do so. He dies, you finish the mission, you earn an achievement. It's ridiculous but then, that is Borderlands 2 through and through.