Achievements are designed to reward players for reaching certain milestones and completing specific challenges during a playthrough of a game, but there are a few that only true "Achievement hunters" would try to earn because of how difficult they were. Many developers will place one or two Achievements in their games that are brutally difficult so that the game doesn't end up being too easy to 100% complete, but some of these Achievements were so ridiculously hard that they felt near-impossible to earn.