Since achievements were introduced on the Xbox 360, there have been some brutal ones. Rock Band 2 challenged players to complete every song in the game consecutively without pausing. The Gears of War series offered the increasingly difficult series of "Seriously" achievements. And The Stanley Parable: Ultra Deluxe forces you not to play the game for ten years.
While that is time-consuming, you don't have to spend hours and hours in front of your game. That's unlike the new Bullet Heaven game, TerraTech Legion, which has an achievement that will likely take players somewhere between six and seven THOUSAND hours to unlock.
"A Good Start" is the name of TerraTech Legion's brutal achievement, and that might just be underselling it a smidge. The achievement challenges players to "destroy 100,000,000 Legion bots of any type", and some players have done the math on how long that will take.
In one discussion on the TrueAchievements forum, users Warlord Ethan and WNG100 estimated that it'd take around 6,150 hours. They calculated the average run time, which clocked in at 32:36, with an average of 8,824 kills per run, and extrapolated it until they hit 100,000,000.
A second discussion on Reddit estimated...
