Devil May Cry 4
46 Achievements
1,000
80-100h
Xbox 360
A Comfortable Pace
Clear mission 11 in Human Mode.
10
How to unlock the A Comfortable Pace achievement in Devil May Cry 4 - Definitive Guide
Just to add a little something, must be done in human mode. It will not count if done on a higher difficulty. So you must play through missions 1 - 11 in human mode to unlock.
Simply play through the game. This is one of the normal story progression achievements.