10 Rarest Xbox Achievements

Rarity: 0.01%

When you think of a game you painstakingly put hours of hard work into to get an elusive trophy or victory, you probably think of the likes of Dark Souls or Super Meat Boy.

You probably don't think of NBA 2k18 - and yet, the Work Complete achievement can take three hundred hours to complete or more.

This is because you have to complete every checklist goal, which involves earning all the two hundred and ninety seven stars in Domination, earning every challenge token, and beating every opposing team's Schedule. What does this mean?

Well, it means you're in for over a thousand games - as beating the schedules alone equals nine hundred games - and every difficult match you avoided when you first went through the game.

It's also worth saying that the achievement is missable, as the challenge tokens require you to complete weekly challenges - which is great, because it means you could have accomplished hours upon hours of other tasks, just to find out it was literally for nothing.